CN102158948A - Method for obtaining up time advance in carrier aggregation - Google Patents
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Abstract
Translated fromChinese
Description
Translated fromChinese技术领域technical field
本发明涉及无线通讯领域，特别涉及一种载波聚合中获得上行定时提前量的方法。The invention relates to the field of wireless communication, in particular to a method for obtaining uplink timing advance in carrier aggregation.
背景技术Background technique
为了满足IMT-Advanced的需求，3GPP开展了LTE-Advanced项目的研究，即LTE的演进系统。LTE-Advanced系统的关键技术包括：多天线增强(Enhanced MIMO)技术、载波聚合(Carrier Aggregation，CA)技术、中继(Relaying技术)和多点协作传输(Coordinated Multi-point，CoMP)技术等。其中，载波聚合技术是提高数据传输速率的最直接方法，载波聚合是指用户设备(UE)的数据可以在多个成员载波(Component Carrier，CC)上同时传输，相当于增加了用户的传输带宽。在LTE Rel-10中，每个CC都应该后向兼容LTE Rel-8/9，即每个CC的带宽都是LTE Rel-8/9中定义的带宽(例如，1.4MHz，、3MHz，、5MHz，、10MHz，、15MHz，或20MHz)，并且Rel-8/9的UE也可以接入单个CC。3GPP规定一个用户可以同时使用的CC最多为5个，这样单个用户的最大传输带宽理论上可以达到100MHz，这将极大地提高用户数据传输的峰值速率。In order to meet the requirements of IMT-Advanced, 3GPP has carried out the research on the project of LTE-Advanced, that is, the evolution system of LTE. The key technologies of the LTE-Advanced system include: Multi-antenna Enhanced (Enhanced MIMO) technology, Carrier Aggregation (Carrier Aggregation, CA) technology, Relay (Relaying technology), and Coordinated Multi-point transmission (Coordinated Multi-point, CoMP) technology, etc. Among them, the carrier aggregation technology is the most direct method to increase the data transmission rate. Carrier aggregation means that the data of the user equipment (UE) can be transmitted simultaneously on multiple component carriers (Component Carrier, CC), which is equivalent to increasing the transmission bandwidth of the user. . In LTE Rel-10, each CC should be backward compatible with LTE Rel-8/9, that is, the bandwidth of each CC is the bandwidth defined in LTE Rel-8/9 (for example, 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, or 20MHz), and a Rel-8/9 UE can also access a single CC. 3GPP stipulates that a user can use up to 5 CCs at the same time, so that the maximum transmission bandwidth of a single user can theoretically reach 100MHz, which will greatly increase the peak rate of user data transmission.
根据上、下行成员载波所处的频段，载波聚合可以分为intra-band载波聚合和inter-band载波聚合。intra-band载波聚合是指聚合在一起的多个CC属于同一个频段，inter-band载波聚合是指聚合在一起的多个CC处于不同的频段。在LTE Rel-10中，对于FDD系统，下行方向支持intra-band载波聚合和inter-band载波聚合，而上行仅支持intra-band载波聚合。对于TDD系统，下行和上行方向都仅支持intra-band载波聚合。According to the frequency bands where the uplink and downlink component carriers are located, carrier aggregation can be divided into intra-band carrier aggregation and inter-band carrier aggregation. Intra-band carrier aggregation means that multiple CCs aggregated belong to the same frequency band, and inter-band carrier aggregation means that multiple CCs aggregated together belong to different frequency bands. In LTE Rel-10, for the FDD system, the downlink supports intra-band carrier aggregation and inter-band carrier aggregation, while the uplink only supports intra-band carrier aggregation. For a TDD system, only intra-band carrier aggregation is supported in both the downlink and uplink directions.
CC代表一个上行载波或一个下行载波，一个上行CC和一个下行CC通过某种对应关系关联到一起就构成了一个小区(Cell)，所以载波聚合也被称为小区聚合(Cell Aggregation)。为了支持上、下行业务的不对称性，一个小区也可以只有下行CC而没有上行CC。A CC represents an uplink carrier or a downlink carrier. An uplink CC and a downlink CC are associated together through a certain correspondence to form a cell (Cell), so carrier aggregation is also called cell aggregation (Cell Aggregation). In order to support the asymmetry between uplink and downlink services, a cell may only have downlink CCs but no uplink CCs.
为了便于对成员载波进行管理，3GPP又引入了主成员载波(Primary CC，PCC)和辅成员载波(Secondary CC，SCC)的概念，并且规定每个UE最多具有一个上行PCC和一个下行PCC。下行PCC的作用包括建立无线资源控制协议(Radio Resource Control，RRC)信令连接、非接入层(Non-Access Stratum，NAS)移动性和作为安全性参数的输入等；上行PCC用于发送物理层的控制信息。下行PCC和上行PCC关联到一起构成了主小区(Primary Cell，PCell)，下行SCC和相关联的上行SCC一起构成了辅小区(Secondary Cell，SCell)。In order to facilitate the management of component carriers, 3GPP introduced the concepts of primary component carrier (Primary CC, PCC) and secondary component carrier (Secondary CC, SCC), and stipulated that each UE has at most one uplink PCC and one downlink PCC. The role of the downlink PCC includes establishing a radio resource control protocol (Radio Resource Control, RRC) signaling connection, non-access stratum (Non-Access Stratum, NAS) mobility, and inputting security parameters; the uplink PCC is used to send physical Layer control information. The downlink PCC and the uplink PCC are associated together to form a primary cell (Primary Cell, PCell), and the downlink SCC and the associated uplink SCC together form a secondary cell (Secondary Cell, SCell).
图1为intra-band载波聚合的示意图，图2为inter-band载波聚合的示意图。其中，用向下的箭头表示下行CC，用向上的箭头表示上行CC，用斜杠阴影表示下行PCC，用方块阴影表示上行PCC。如图1所示，下行的三个CC属于同一频段：频段A，上行的两个CC属于同一频段：频段A。如图2所示，下行的三个CC属于不同频段：频段A和频段B，上行的两个CC属于同一频段：频段A。FIG. 1 is a schematic diagram of intra-band carrier aggregation, and FIG. 2 is a schematic diagram of inter-band carrier aggregation. Wherein, a downward arrow represents a downlink CC, an upward arrow represents an uplink CC, a slash shading represents a downlink PCC, and a square shading represents an uplink PCC. As shown in Figure 1, the three downlink CCs belong to the same frequency band: frequency band A, and the two uplink CCs belong to the same frequency band: frequency band A. As shown in Figure 2, the three downlink CCs belong to different frequency bands: frequency band A and frequency band B, and the two uplink CCs belong to the same frequency band: frequency band A.
图3为载波聚合的5种场景示意图。如图3所示，载波聚合共有5种部署场景。下面以2个CC(CC1和CC2)的载波聚合为例对各种场景分别进行介绍，其中，2个CC可都为上行CC，也可都为下行CC，也可一个为上行CC，另一个为下行CC。在场景1中，CC1和CC2属于相同的基站(eNB)，CC1和CC2的覆盖范围基本相同；场景1的典型情况是intra-band载波聚合。在场景2中，CC1和CC2属于相同的eNB，但CC1和CC2的覆盖范围不同；CC1的覆盖范围大，用来提供覆盖，CC2的覆盖范围小，用来提高eNB中心覆盖区域的容量。在场景3中，CC1和CC2属于相同的eNB，但是两个CC的天线指向不一致：CC1用来提供覆盖，CC2用来提高CC1小区边缘的容量。在场景4中，CC1属于eNB，CC2属于eNB的射频远端(Radio Remote Header，RRH)，RRH与eNB通过光纤相连；CC1用来提供覆盖，CC2用来提供热点地区的容量。在场景5中，CC1和CC2属于相同的eNB，该eNB覆盖范围内部署的直放站(repeater)可以放大CC2频段上的信号，从而扩大了CC2的覆盖范围。FIG. 3 is a schematic diagram of five scenarios of carrier aggregation. As shown in Figure 3, there are five deployment scenarios for carrier aggregation. The following takes the carrier aggregation of two CCs (CC1 and CC2) as an example to introduce various scenarios. Among them, the two CCs can both be uplink CCs, or both can be downlink CCs, or one can be an uplink CC and the other can be an uplink CC. It is the downlink CC. In
在同一个eNB的覆盖范围内，各个UE与eNB之间的距离可能不一样，上行数据到达eNB的传输时延也就不一样。为了消除用户间的干扰，多个UE的上行数据必须同时到达eNB。上行定时提前量(Timing Advance，TA)就是为了实现该目的而提出的，TA弥补了UE和eNB之间的无线电波传播时延，TA的大小反映了UE与eNB之间的距离远近，距离eNB远的UE的TA值大一些，距离eNB近的UE的TA值小一些，从而保证数据同时到达用户。Within the coverage of the same eNB, the distance between each UE and the eNB may be different, and the transmission delay for uplink data to reach the eNB is also different. In order to eliminate interference between users, the uplink data of multiple UEs must arrive at the eNB at the same time. The uplink timing advance (Timing Advance, TA) is proposed to achieve this purpose. TA makes up for the radio wave propagation delay between UE and eNB. The size of TA reflects the distance between UE and eNB. The TA value of the far UE is larger, and the TA value of the UE closer to the eNB is smaller, so as to ensure that the data reaches the users at the same time.
在Rel-10中，对于载波聚合的5种场景，无论是FDD系统还是TDD系统，上行方向都只支持intra-band载波聚合，一个UE只具有唯一的TA值，即在多个CC上同时发送数据。其中，UE获得TA的方法为两种：第一种方式是在随机接入过程中，eNB通过随机接入响应(Random Access Response，RAR)消息通知UE需要使用的TA值，此TA值是一个绝对值，长度是11比特，实际上，UE利用这11比特进行换算，得出实际的以微秒(us)为单位的TA值；第二种方式是UE上行同步状况变差之后，eNB通过媒体访问控制控制单元(MAC控制单元)通知UE对TA值进行更新，MAC控制单元携带的TA值是一个相对值，TA值的长度是6比特，TA相对值的参考基准是先前使用的旧TA值，旧TA值与MAC控制单元携带的TA值之和为更新后的TA值。图4为现有技术中MAC控制单元的示意图，如图4所示，MAC控制单元的长度是1字节(byte)，MAC控制单元的前2位为预留比特“R”，剩下的6位为TA值。另外，在MAC控制单元之前还包括逻辑信道标识(LCID)(图未示出)，其作为头部(header)的一部分，用于标识MAC控制单元的信息类型，即表明MAC控制单元中的信息为一个TA。UE根据LCID可识别MAC控制单元中每一个比特表示的信息。In Rel-10, for the five scenarios of carrier aggregation, whether it is an FDD system or a TDD system, only intra-band carrier aggregation is supported in the uplink direction, and a UE only has a unique TA value, that is, it transmits on multiple CCs simultaneously data. Among them, there are two methods for the UE to obtain the TA: the first method is that during the random access process, the eNB notifies the UE of the TA value to be used through a Random Access Response (Random Access Response, RAR) message, and the TA value is a The absolute value, the length is 11 bits. In fact, the UE uses these 11 bits for conversion to obtain the actual TA value in microseconds (us); The media access control control unit (MAC control unit) notifies the UE to update the TA value. The TA value carried by the MAC control unit is a relative value. The length of the TA value is 6 bits. The reference of the TA relative value is the old TA previously used value, the sum of the old TA value and the TA value carried by the MAC control element is the updated TA value. Fig. 4 is the schematic diagram of MAC control unit in the prior art, as shown in Fig. 4, the length of MAC control unit is 1 byte (byte), the first 2 bits of MAC control unit are reserved bit " R ", remaining 6 bits are TA value. In addition, a logical channel identifier (LCID) (not shown) is also included before the MAC control unit, which is used as a part of the header to identify the information type of the MAC control unit, that is, to indicate the information in the MAC control unit for a TA. The UE can identify the information represented by each bit in the MAC control element according to the LCID.
需要说明的是，上述两种方法分别适用于不同的场景，例如，UE初始接入时就是通过随机接入响应获得初始的TA值，而在RRC_CONNECTED状态下，由于UE移动导致TA值发生改变时，eNB可以通过MAC CE通知UE新的TA值。It should be noted that the above two methods are applicable to different scenarios. For example, when the UE initially accesses, the initial TA value is obtained through a random access response, and in the RRC_CONNECTED state, when the TA value changes due to UE movement , the eNB can notify the UE of the new TA value through the MAC CE.
但是，若需在上行方向支持inter-band载波聚合的话，上述场景4和5都要求UE必须支持多个TA值，下面对具体原因进行介绍。However, if it is necessary to support inter-band carrier aggregation in the uplink direction, both scenarios 4 and 5 above require the UE to support multiple TA values, and the specific reasons will be introduced below.
图5为载波聚合场景4的示意图，如图5所示，在场景5中，eNB通过光纤拉远与射频远端(RRH)连接到一起。UE发送到eNB和RRH的数据统一地在eNB处进行处理。eNB与RRH之间是有线连接，二者之间的传输时延可以忽略。UE在CC1上发送的数据直接发送到eNB，在CC2上发送的数据被RRH接收到之后通过光纤转发给eNB。因为UE距离eNB和RRH的距离不一样，为了保证不同频率上的数据同步到达eNB，UE在CC2上数据发送时间要提前于CC1上数据的发送时间，即无论CC1和CC2是否处于同一频段，CC1和CC2需要对应不同的TA值。FIG. 5 is a schematic diagram of carrier aggregation scenario 4. As shown in FIG. 5 , in scenario 5, the eNB is connected to the remote radio head (RRH) through optical fiber. The data sent by the UE to the eNB and the RRH are uniformly processed at the eNB. There is a wired connection between the eNB and the RRH, and the transmission delay between them can be ignored. The data sent by UE on CC1 is directly sent to eNB, and the data sent on CC2 is received by RRH and forwarded to eNB through optical fiber. Because the distance between the UE and the eNB and RRH is different, in order to ensure that data on different frequencies arrive at the eNB synchronously, the UE's data transmission time on CC2 must be ahead of the data transmission time on CC1, that is, regardless of whether CC1 and CC2 are in the same frequency band, CC1 and CC2 need to correspond to different TA values.
图6为载波聚合场景5的示意图，如图6所示，在场景5中，eNB的覆盖范围内部署了直放站(repeater)，用于扩展覆盖范围。直放站只能放大某一个频段范围内的频率。在上行(UL)方向上，假设UE配置了载波CC1和CC2两个载波，并且CC1和CC2属于不同的频段，此时上行方向相当于inter-band载波聚合。CC1的覆盖范围较大，UE在CC1上发送的数据可以直接发送到eNB；CC2的覆盖范围较小，UE在CC2上发送的数据只有经过直放站放大处理后才能到达eNB，因此CC2上的数据经历了额外的处理时延。也就是说，UE在CC1和CC2上同时发送数据，但到达eNB的时刻不一致。所以，为了保证不同频率上的数据同步到达eNB，CC1和CC2必须对应不同的TA值。FIG. 6 is a schematic diagram of carrier aggregation scenario 5. As shown in FIG. 6 , in scenario 5, a repeater is deployed within the coverage of the eNB for extending the coverage. The repeater can only amplify frequencies within a certain frequency range. In the uplink (UL) direction, assuming that the UE is configured with two carriers, CC1 and CC2, and CC1 and CC2 belong to different frequency bands, the uplink direction is equivalent to inter-band carrier aggregation. CC1 has a large coverage area, and the data sent by UE on CC1 can be directly sent to eNB; CC2 has a small coverage area, and the data sent by UE on CC2 can only reach eNB after being amplified by the repeater, so the data on CC2 Data experiences additional processing delays. That is to say, the UE sends data on CC1 and CC2 at the same time, but the arrival times at the eNB are different. Therefore, in order to ensure that data on different frequencies reach the eNB synchronously, CC1 and CC2 must correspond to different TA values.
而在未来的无线通信系统中，各种新的业务会不断涌现，上行业务的速率也会比Rel-10提出更高的要求，但要在上行方向上找到连续大段的频谱以支持不断增长的上行传输速率需求并非易事，因此，为了充分利用上行方向上现有的频谱资源，需要在上行方向上应用inter-band载波聚合技术。In the future wireless communication system, various new services will continue to emerge, and the rate of uplink services will be higher than that of Rel-10. However, it is necessary to find a continuous large section of spectrum in the uplink direction to support the continuous growth. Therefore, in order to make full use of the existing spectrum resources in the uplink direction, it is necessary to apply inter-band carrier aggregation technology in the uplink direction.
综上，在现有技术中，一个UE仅获取一个TA值，在上行方向无法支持载波聚合场景4和5，因此，如果未来在上行方向上应用inter-band载波聚合技术，并使之能够应用在场景4和5，则必然要求一个UE能够获取多个TA值，然而，现有技术还未提出相应的解决方案。To sum up, in the existing technology, a UE only obtains one TA value, and carrier aggregation scenarios 4 and 5 cannot be supported in the uplink direction. Therefore, if the inter-band carrier aggregation technology is applied in the uplink direction in the future, and it can be applied In scenarios 4 and 5, it is necessary for a UE to be able to obtain multiple TA values, however, no corresponding solution has been proposed in the prior art.
发明内容Contents of the invention
有鉴于此，本发明提供一种载波聚合中获得上行定时提前量的方法，能够使得一个UE获取多个TA值。In view of this, the present invention provides a method for obtaining uplink timing advance in carrier aggregation, which enables one UE to obtain multiple TA values.
为实现上述发明目的，本发明的技术方案是这样实现的：For realizing above-mentioned purpose of the invention, technical scheme of the present invention is realized like this:
一种载波聚合中获得上行定时提前量的方法，预先为用户设备UE配置多个上行成员载波CC，以供UE使用所配置的多个上行CC同时进行上行数据传输，该方法包括：A method for obtaining an uplink timing advance in carrier aggregation, configuring multiple uplink component carriers CCs for a user equipment UE in advance, so that the UE uses the configured multiple uplink CCs to simultaneously perform uplink data transmission, the method includes:
A、基站eNB将多个上行CC分为多个小组，每个小组所包括的上行CC的数量至少为一个，并将分组信息以及每个上行CC所属小组的标识告知UE；A. The base station eNB divides multiple uplink CCs into multiple groups, each group includes at least one uplink CC, and notifies the UE of the group information and the identity of the group to which each uplink CC belongs;
B、eNB为每个小组配置不同的上行定时提前量TA值，UE的每个小组分别通过随机接入过程获取该小组对应的TA值，该小组内每个上行CC将小组对应的TA值作为自身对应的TA值。B. The eNB configures different uplink timing advance TA values for each group, and each group of UE obtains the TA value corresponding to the group through the random access process, and each uplink CC in the group uses the TA value corresponding to the group as The TA value corresponding to itself.
该方法进一步包括：The method further includes:
步骤C、eNB向UE发送每个小组对应的TA更新值，对于每个小组，UE将该小组对应的TA更新值与步骤B中该小组对应的TA值相加，作为该小组对应的更新后TA值，该小组内每个上行CC将小组对应的更新后TA值作为自身对应的更新后TA值。Step C, eNB sends the TA update value corresponding to each group to the UE, for each group, the UE adds the TA update value corresponding to the group to the TA value corresponding to the group in step B, as the updated TA value corresponding to the group TA value, each uplink CC in the group uses the updated TA value corresponding to the group as its corresponding updated TA value.
步骤A所述将多个上行CC分为多个小组的方法包括：The method for dividing multiple uplink CCs into multiple groups described in step A includes:
将属于相同频段的上行CC划分到同一小组；或，Divide uplink CCs belonging to the same frequency band into the same group; or,
将属于不同频段的，但频率间隔的绝对值小于第一门限的上行CC划分到同一小组，将属于相同频段的，但频率间隔的绝对值大于第二门限的上行CC划分到不同小组。Divide uplink CCs that belong to different frequency bands but whose absolute value of the frequency interval is smaller than the first threshold into the same group, and classify uplink CCs that belong to the same frequency band but whose absolute value of the frequency interval is greater than the second threshold into different groups.
步骤A所述将分组信息以及每个上行CC所属小组的标识告知UE的方法包括：eNB向UE发送无线资源控制协议RRC连接重配置消息，该消息携带分组信息以及每个上行CC所属小组的标识。The method of notifying the UE of the grouping information and the identification of the group to which each uplink CC belongs as described in step A includes: the eNB sends a radio resource control protocol RRC connection reconfiguration message to the UE, and the message carries the grouping information and the identification of the group to which each uplink CC belongs .
步骤C中所述向UE发送每个小组对应的TA更新值的方法为：eNB配置任意一个下行CC的媒体访问MAC控制单元，MAC控制单元携带所有小组对应的TA更新值，并将所述携带TA更新值的MAC控制单元发送至UE。The method of sending the TA update value corresponding to each subgroup to the UE in step C is as follows: eNB configures the media access MAC control unit of any downlink CC, and the MAC control unit carries the TA update value corresponding to all subgroups, and carries the The MAC control element of the TA update value is sent to the UE.
在所述MAC控制单元中，用第一个字节的位图标识多个小组对应的TA更新值，其中，如果携带的TA更新值为N个，则MAC控制单元的字节个数为N+1，其中，第一个字节表示携带的TA更新值对应的小组，其余N个字节分别按照小组的顺序依次表示每个小组对应的TA更新值，在所述N个字节中，每个字节的前两位为预留比特，剩余六位为该小组对应的TA更新值。In the MAC control unit, the bitmap of the first byte is used to identify the TA update values corresponding to multiple groups, wherein, if there are N TA update values carried, the number of bytes of the MAC control unit is N +1, where the first byte represents the group corresponding to the carried TA update value, and the remaining N bytes respectively represent the TA update value corresponding to each group in the order of the group, among the N bytes, The first two bits of each byte are reserved bits, and the remaining six bits are the TA update value corresponding to the group.
如果MAC控制单元携带的TA更新值为N个，则MAC控制单元的字节个数为N，每个字节的前两位为表示该小组的标识，剩余六位为该小组对应的TA更新值。If the TA update value carried by the MAC control unit is N, the number of bytes of the MAC control unit is N, the first two bits of each byte are the identification of the group, and the remaining six bits are the TA update corresponding to the group value.
步骤C中所述向UE发送每个小组对应的TA更新值的方法为：eNB配置任意一个下行CC的多个媒体访问MAC控制单元，每个MAC控制单元携带一个小组对应的TA更新值，并将所述携带TA更新值的每个MAC控制单元发送至UE。The method for sending the TA update value corresponding to each group to the UE in step C is: the eNB configures multiple media access MAC control units of any downlink CC, each MAC control unit carries a TA update value corresponding to a group, and Each MAC control element carrying the TA update value is sent to the UE.
步骤C中所述向UE发送每个小组对应的TA更新值的方法为：eNB配置多个下行CC的多个MAC控制单元，每个MAC控制单元携带一个小组对应的TA更新值，并将所述携带TA更新值的每个MAC控制单元发送至UE。The method for sending the TA update value corresponding to each subgroup to the UE in step C is: the eNB configures multiple MAC control units of multiple downlink CCs, each MAC control unit carries a TA update value corresponding to a subgroup, and sends the Each MAC control element carrying the TA update value is sent to the UE.
如果MAC控制单元携带的TA更新值为N个，则MAC控制单元的数量总和为N个，其中，每个MAC控制单元为一个字节，每个字节的前两位为表示该小组的标识，剩余六位为该小组对应的TA更新值。If the TA update value carried by the MAC control unit is N, the total number of MAC control units is N, where each MAC control unit is a byte, and the first two bits of each byte are the identification of the group , and the remaining six bits are the TA update value corresponding to the group.
根据本发明所提供的技术方案，eNB将多个上行CC分为多个小组，每个小组所包括的上行CC的数量至少为一个，并将分组信息以及每个上行CC所属小组的标识告知UE，eNB为每个小组配置不同的TA值，UE的每个小组分别通过随机接入过程获取该小组对应的TA值，该小组内每个上行CC将小组对应的TA值作为自身对应的TA值，可见，本发明所提供的方法能够使得一个UE获取多个TA值。According to the technical solution provided by the present invention, the eNB divides multiple uplink CCs into multiple groups, each group includes at least one uplink CC, and notifies the UE of the group information and the identity of the group to which each uplink CC belongs , eNB configures different TA values for each group, and each group of UE obtains the TA value corresponding to the group through the random access process, and each uplink CC in the group uses the TA value corresponding to the group as its corresponding TA value , it can be seen that the method provided by the present invention enables one UE to obtain multiple TA values.
另外，为本发明仍然沿用现有技术中初始TA值传递的方法，以及TA更新值的传递方法，只不过在进行初始TA值传递时，考虑如何以小组为单位将多个TA值传递给UE，在进行TA更新值的传递时，考虑对MAC控制单元的格式进行更改以实现多个TA值的传递，因此，本发明的方案保证了对LTE版本的后向兼容性。In addition, the present invention still uses the method of transferring the initial TA value and the method of transferring the TA update value in the prior art, but when performing the initial TA value transfer, consider how to transfer multiple TA values to the UE in units of groups , when transmitting the TA update value, it is considered to change the format of the MAC control element to realize the transmission of multiple TA values. Therefore, the solution of the present invention ensures the backward compatibility to the LTE version.
附图说明Description of drawings
图1为intra-band载波聚合的示意图。FIG. 1 is a schematic diagram of intra-band carrier aggregation.
图2为inter-band载波聚合的示意图。FIG. 2 is a schematic diagram of inter-band carrier aggregation.
图3为载波聚合的5种场景示意图。FIG. 3 is a schematic diagram of five scenarios of carrier aggregation.
图4为现有技术中MAC控制单元的示意图。Fig. 4 is a schematic diagram of a MAC control unit in the prior art.
图5为载波聚合场景4的示意图。FIG. 5 is a schematic diagram of carrier aggregation scenario 4.
图6为载波聚合场景5的示意图。FIG. 6 is a schematic diagram of carrier aggregation scenario 5.
图7为本发明所提供的一种载波聚合中获得上行定时提前量的方法的流程图。FIG. 7 is a flow chart of a method for obtaining an uplink timing advance in carrier aggregation provided by the present invention.
图8为采用位图表示两个TA更新值的实施例的示意图。FIG. 8 is a schematic diagram of an embodiment using a bitmap to represent two TA update values.
图9为采用预留比特“R”表示两个TA更新值的实施例的示意图。FIG. 9 is a schematic diagram of an embodiment of using a reserved bit "R" to represent two TA update values.
图10为两个TA更新值分别包含在同一个下行CC的两个MAC控制单元的实施例的示意图。FIG. 10 is a schematic diagram of an embodiment in which two TA update values are respectively included in two MAC control elements of the same downlink CC.
图11为两个TA更新值分别包含在两个下行CC的两个MAC控制单元的实施例的示意图。FIG. 11 is a schematic diagram of an embodiment in which two TA update values are respectively included in two MAC control elements of two downlink CCs.
具体实施方式Detailed ways
为使本发明的目的、技术方案及优点更加清楚明白，以下参照附图并举实施例，对本发明所述方案作进一步地详细说明。In order to make the object, technical solution and advantages of the present invention clearer, the solutions of the present invention will be further described in detail below with reference to the accompanying drawings and examples.
图7为本发明所提供的一种载波聚合中获得上行定时提前量的方法的流程图。本发明能够应用在上行inter-band载波聚合的情况下，特别能够支持载波聚合场景4和5，在步骤101之前，预先为UE配置多个上行CC，以供UE使用所配置的多个上行CC同时进行上行数据传输。依照目前协议的规定，为UE配置的上行CC的数量最多为5个。FIG. 7 is a flow chart of a method for obtaining an uplink timing advance in carrier aggregation provided by the present invention. The present invention can be applied in the case of uplink inter-band carrier aggregation, and can especially support carrier aggregation scenarios 4 and 5. Before
另外，为了描述简便，除非特别说明，下述CC均指上行CC。In addition, for simplicity of description, unless otherwise specified, the following CCs refer to uplink CCs.
下面，对图7所示方法进行详细介绍，如图7所示，该方法包括以下步骤：Below, the method shown in Figure 7 is introduced in detail, as shown in Figure 7, the method includes the following steps:
步骤101，eNB将多个上行CC分为多个小组，每个小组所包括的上行CC的数量至少为一个，并将分组信息以及每个上行CC所属小组的标识告知UE。In
将CC分组的目的是为了降低随机接入的复杂度，同一组内的CC具有相同的TA值，UE只需要发起一次随机接入过程即可以获得该CC组内所有CC对应的TA值。The purpose of grouping CCs is to reduce the complexity of random access. CCs in the same group have the same TA value, and the UE only needs to initiate a random access process once to obtain the TA values corresponding to all CCs in the CC group.
在本步骤中，分组的方法比较灵活，对分组的方法以及所分小组的数量没有具体限定。在此，仅以两种分组方法为例进行说明：In this step, the method of grouping is relatively flexible, and there is no specific limitation on the method of grouping and the number of groups to be grouped. Here, only two grouping methods are used as examples for illustration:
第一，将属于相同频段的CC划分到同一小组。First, CCs belonging to the same frequency band are divided into the same group.
例如，假设UE支持5个CC：CC1、CC2、CC3、CC4、CC5，CC 1和CC2属于频段A，CC3和CC4属于频段B，CC5属于频段C，则可将CC1和CC2划为到第1小组，将CC3和CC4划为到第2小组，CC5划分到第3小组。For example, assuming that the UE supports 5 CCs: CC1, CC2, CC3, CC4, and CC5,
因为同一频段内的CC具有类似的传输特性，可将同一频段的CC划为为一组，因此可为同一频段的CC配置相同的TA值。Rel-10上行只支持intra-band载波聚合，UE具有唯一的TA值，就是这个道理。Because the CCs in the same frequency band have similar transmission characteristics, the CCs in the same frequency band can be grouped into one group, so the same TA value can be configured for the CCs in the same frequency band. Rel-10 uplink only supports intra-band carrier aggregation, and the UE has a unique TA value, which is why.
第二，将属于不同频段的，但频率间隔的绝对值小于第一门限的CC划分到同一小组，将属于相同频段的，但频率间隔的绝对值大于第二门限的CC划分到不同小组。Second, divide CCs that belong to different frequency bands but whose absolute value of frequency separation is smaller than the first threshold into the same group, and divide CCs that belong to the same frequency band but whose absolute value of frequency separation is greater than the second threshold into different groups.
也就是说，如果若干个CC虽然属于不同频段，但是这几个CC的频率很接近，也可将这几个CC划分到同一组；反之，如果若干个CC虽然属于相同频段，但是这几个CC的频率差距很大，也可将这几个CC划分到不同组。That is to say, if several CCs belong to different frequency bands, but the frequencies of these CCs are very close, you can also divide these CCs into the same group; conversely, if several CCs belong to the same frequency band, but these several CCs The frequencies of the CCs vary greatly, and these CCs can also be divided into different groups.
例如，假设UE支持5个CC：CC1、CC2、CC3、CC4、CC5，CC1和CC2属于频段A，CC3和CC4属于频段B，CC5属于频段C，如果CC2和CC3的频率之差的绝对值小于第一门限，则可将CC2和CC3划为到第1小组，如果CC4和CC5的频率之差的绝对值小于第一门限，则可将CC4和CC5划为到第2小组，如果CC1和CC2的频率之差的绝对值大于第二门限，则CC1不划分至第1小组，可将CC1单独划分到第3小组。For example, suppose the UE supports 5 CCs: CC1, CC2, CC3, CC4, and CC5. CC1 and CC2 belong to frequency band A, CC3 and CC4 belong to frequency band B, and CC5 belongs to frequency band C. If the absolute value of the frequency difference between CC2 and CC3 is less than The first threshold, CC2 and CC3 can be classified as the first group, if the absolute value of the frequency difference between CC4 and CC5 is less than the first threshold, then CC4 and CC5 can be classified as the second group, if CC1 and CC2 If the absolute value of the frequency difference is greater than the second threshold, then CC1 will not be divided into the first group, and CC1 can be separately divided into the third group.
将处于多个不同频段的CC划分到同一个CC组中可以降低随机接入的复杂度，而将处于同一频段的CC划分到不同的CC组中可以提高上行同步的准确性。Dividing CCs in multiple different frequency bands into the same CC group can reduce the complexity of random access, and dividing CCs in the same frequency band into different CC groups can improve the accuracy of uplink synchronization.
在本步骤中，eNB将分组信息告知UE，分组信息用于表示哪个CC被划分至了哪个小组，同时，eNB还将每个CC所属小组的标识告知UE，小组的标识的形式可以为编号、索引等任意形式，仅用于对不同小组进行区分。告知的具体方法为：eNB向UE发送RRC连接重配置消息，该消息携带分组信息以及每个上行CC所属小组的标识。In this step, the eNB informs the UE of the grouping information, which is used to indicate which CC is divided into which group, and at the same time, the eNB also informs the UE of the identity of the group to which each CC belongs. The form of the identity of the group can be number, Arbitrary forms such as indexes are only used to distinguish different groups. The specific method of notification is: the eNB sends an RRC connection reconfiguration message to the UE, and the message carries group information and the identity of the group to which each uplink CC belongs.
具体地，当eNB通过RRC连接重配置消息(RRC Connection Reconfiguration)对UE的服务小区进行配置/重配置的时候，RRC参数配置包含小区级的参数配置和UE级的参数配置。所谓小区级的参数配置，是指该部分的参数配置对同一eNB内的所有UE都适用；而UE级的参数配置，则指该部分的参数配置专门适用于当前UE。eNB在通知UE关于CC的分组信息和小组标识的时候，可以包含在小区级的参数配置中，也可以包含在UE级的参数配置中。如果包含在小区级的参数配置中，那么CC分组方式对所有UE来说都是相同的。如果CC的分组信息包含在UE级的参数配置中，CC分组方式对不同UE来说可以不同。Specifically, when the eNB configures/reconfigures the serving cell of the UE through an RRC Connection Reconfiguration message (RRC Connection Reconfiguration), the RRC parameter configuration includes cell-level parameter configuration and UE-level parameter configuration. The so-called cell-level parameter configuration means that the parameter configuration in this part is applicable to all UEs in the same eNB; while the parameter configuration in UE level means that the parameter configuration in this part is specially applicable to the current UE. When the eNB notifies the UE of the CC grouping information and group identity, it may be included in the parameter configuration at the cell level or in the parameter configuration at the UE level. If included in the cell-level parameter configuration, the CC grouping method is the same for all UEs. If CC grouping information is included in UE-level parameter configuration, CC grouping methods may be different for different UEs.
步骤102，eNB为每个小组配置不同的TA值，UE的每个小组分别通过随机接入过程获取该小组对应的TA值，该小组内每个上行CC将小组对应的TA值作为自身对应的TA值。In
在本步骤中，具体为哪个小组配置多大的TA值是根据实际情况而确定的，例如，结合场景4，对于处于CC1和CC2重叠覆盖范围内的UE，则CC1所属小组对应的TA值大些，CC2所属小组对应的TA值小些。具体配置的方法可参考现有技术中为不同UE配置不同TA值的原则。In this step, the TA value for which group is specifically configured is determined according to the actual situation. For example, in combination with scenario 4, for UEs within the overlapping coverage of CC1 and CC2, the TA value corresponding to the group to which CC1 belongs is larger , the TA value corresponding to the group CC2 belongs to is smaller. For a specific configuration method, reference may be made to the principle of configuring different TA values for different UEs in the prior art.
UE要获得初始的TA值(11比特)，必须进行随机接入过程，实际上，UE利用这11比特进行换算，得出实际的以微秒(us)为单位的TA值，这与现有技术是相同。本步骤与现有技术的区别在于：每个TA值的获得都需要相应的随机接入过程完成，假设共有3个小组，则必须通过三次随机接入过程分别获取每个小组对应的TA值。每个小组的随机接入过程与现有技术是相同的，此处不予赘述。To obtain the initial TA value (11 bits), the UE must perform a random access process. In fact, the UE uses these 11 bits for conversion to obtain the actual TA value in microseconds (us), which is different from existing The technique is the same. The difference between this step and the prior art is that the acquisition of each TA value requires the completion of the corresponding random access process. Assuming that there are 3 groups in total, the TA value corresponding to each group must be obtained through three random access processes. The random access process of each group is the same as that of the prior art, and will not be repeated here.
举例说明，假设CC1和CC2划为到第1小组，CC3和CC4划为到第2小组，CC5划分到第3小组，则第1小组通过随机接入过程获取第1小组对应的TA_1，第2小组通过随机接入过程获取第2小组对应的TA_2，第3小组通过随机接入过程获取第3小区对应的TA_3。For example, assuming that CC1 and CC2 are assigned to the first group, CC3 and CC4 are assigned to the second group, and CC5 is assigned to the third group, then the first group obtains the TA_1 corresponding to the first group through the random access process, and the second group The group obtains the TA_2 corresponding to the second group through the random access process, and the third group obtains the TA_3 corresponding to the third cell through the random access process.
每个小组获得TA值后，则该小组内每个CC将小组对应的TA值作为自身对应的TA值，例如，CC1对应的TA值为TA_1，CC2对应的TA值为TA_1，CC3对应的TA值为TA_2，CC4对应的TA值为TA_2，CC5对应的TA值为TA_3。After each group obtains the TA value, each CC in the group will use the TA value corresponding to the group as its corresponding TA value. For example, the TA value corresponding to CC1 is TA_1, the TA value corresponding to CC2 is TA_1, and the TA value corresponding to CC3 The value is TA_2, the TA value corresponding to CC4 is TA_2, and the TA value corresponding to CC5 is TA_3.
进一步地，和现有技术类似，如果由于UE的移动或其他原因使得UE上行同步状况变差，eNB还通过MAC控制单元通知UE对TA值进行更新，与现有技术不同的是，在现有技术中，MAC控制单元只需携带一个TA值，而在本发明中，需对不同CC的TA值进行更新，因此需要对MAC控制单元携带的内容以及格式等进行更改，下面结合步骤103详细说明。Furthermore, similar to the prior art, if the uplink synchronization status of the UE deteriorates due to UE movement or other reasons, the eNB also notifies the UE to update the TA value through the MAC control unit. Unlike the prior art, in the existing In the technology, the MAC control unit only needs to carry one TA value, but in the present invention, the TA values of different CCs need to be updated, so the content and format carried by the MAC control unit need to be changed, and the following will be described in detail in conjunction with
步骤103，eNB向UE发送每个小组对应的TA更新值，对于每个小组，UE将该小组对应的TA更新值与步骤102中该小组对应的TA值相加，作为该小组对应的更新后TA值，该小组内每个上行CC将小组对应的更新后TA值作为自身对应的更新后TA值。In
在本步骤中，eNB向UE发送小组对应的TA更新值可以有以下几种方式：In this step, the eNB sends the TA update value corresponding to the group to the UE in the following ways:
第一种方法，eNB配置任意一个下行CC的MAC控制单元，MAC控制单元携带所有小组对应的TA更新值，并将所述携带TA更新值的MAC控制单元发送至UE。In the first method, the eNB configures a MAC control unit of any downlink CC, and the MAC control unit carries TA update values corresponding to all subgroups, and sends the MAC control unit carrying the TA update values to the UE.
在第一种方法中，如果多个TA更新值在同一个下行CC的同一个MAC控制单元中发送，需要引入新的MAC控制单元格式，因为Rel-10及以前协议版本中的TA值MAC控制单元是固定长度的，长度是1字节(byte)，无法满足多个TA值可变长度MAC控制单元的要求。In the first method, if multiple TA update values are sent in the same MAC control element of the same downlink CC, a new MAC control element format needs to be introduced, because the TA value MAC control in Rel-10 and previous protocol versions The unit is of fixed length, and the length is 1 byte (byte), which cannot meet the requirements of variable-length MAC control units with multiple TA values.
多个TA更新值包含在同一个MAC控制单元中发送，也有不同的实现方法，以下仅以两个例子说明。Multiple TA update values are sent in the same MAC control element, and there are also different implementation methods, which are described below with only two examples.
例如，一种方法是在该MAC控制单元中，用一个字节的位图(Bitmap)标识多个小组对应的TA更新值(第一个字节称作位图)，例如，如果携带的TA更新值为N个，则MAC控制单元的字节个数为N+1，其中，第一个字节表示携带的TA更新值对应的小组，其余N个字节分别按照小组的顺序依次表示每个小组对应的TA更新值，在这N个字节中，每个字节的前两位为预留比特“R”，剩余六位为该小组对应的TA更新值。图8为采用位图表示两个TA更新值的实施例的示意图，如图8所示，位图包括三行，每一行均为8比特，即每一行为一个字节，第一字节表示TA更新值对应的小组，若携带的是第1小组和第2小组对应的TA更新值，则第一字节为00000011，以此类推，若携带的是第1小组、第2小组和第3小组对应的TA更新值，则第一字节为00000111，若携带的是第2小组和第3小组对应的TA更新值，则第一字节为00000110。在此，图8仅以携带第1小组和第2小组为例。第二字节中的前两位为预留比特“R”，剩余六位为第1小组对应的TA更新值TA_1，第三字节中的前两位为预留比特“R”，剩余六位为第2小组对应的TA更新值TA_2，可见，第二字节和第三字节的格式和现有技术中MAC控制单元的格式相同。需要说明的是，上述位图的格式仅为举例说明，并非用于限定仅存在上述一种实施方式。For example, one method is to use a one-byte bitmap (Bitmap) in the MAC control unit to identify the TA update values corresponding to multiple groups (the first byte is called a bitmap), for example, if the carried TA The update value is N, and the number of bytes of the MAC control unit is N+1, wherein the first byte represents the group corresponding to the carried TA update value, and the remaining N bytes represent each The TA update value corresponding to each group, in these N bytes, the first two bits of each byte are the reserved bit "R", and the remaining six bits are the TA update value corresponding to the group. Figure 8 is a schematic diagram of an embodiment using a bitmap to represent two TA update values. As shown in Figure 8, the bitmap includes three lines, each line is 8 bits, that is, each line is one byte, and the first byte represents The group corresponding to the TA update value, if it carries the TA update value corresponding to the 1st group and the 2nd group, the first byte is 00000011, and so on, if it carries the 1st group, the 2nd group and the 3rd group For the TA update value corresponding to the group, the first byte is 00000111. If it carries the TA update values corresponding to the second group and the third group, the first byte is 00000110. Here, FIG. 8 only takes the carrying of the first group and the second group as an example. The first two bits in the second byte are reserved bits "R", the remaining six bits are the TA update value TA_1 corresponding to the first group, the first two bits in the third byte are reserved bits "R", and the remaining six bits are The bit is the TA update value TA_2 corresponding to the second group. It can be seen that the format of the second byte and the third byte is the same as that of the MAC control unit in the prior art. It should be noted that the format of the above bitmap is only for illustration, and is not used to limit the existence of only one implementation manner above.
例如，另一种方法是在MAC控制单元中，利用预留比特“R”表示该小组对应的TA更新值，例如，如果携带的TA更新值为N个，则MAC控制单元的字节个数为N，每个字节的前两位为表示该小组的标识，剩余六位为该小组对应的TA更新值。图9为采用预留比特“R”表示两个TA更新值的实施例的示意图，如图9所示，MAC控制单元包括两个字节，在第一字节中，前两位表示第1小组的标识“00”，剩余六位为第1小组对应的TA更新值TA_1，在第二字节中，前两位表示第2小组的标识“01”，剩余六位为第2小组对应的TA更新值TA_2。For example, another method is to use the reserved bit "R" in the MAC control unit to indicate the TA update value corresponding to the group. For example, if there are N TA update values carried, the number of bytes in the MAC control unit is N, the first two bits of each byte are the identification of the group, and the remaining six bits are the TA update value corresponding to the group. Figure 9 is a schematic diagram of an embodiment in which the reserved bit "R" is used to indicate two TA update values. As shown in Figure 9, the MAC control unit includes two bytes, and in the first byte, the first two bits represent the first The logo of the group is "00", the remaining six digits are the TA update value TA_1 corresponding to the first group, in the second byte, the first two digits represent the logo "01" of the second group, and the remaining six digits are the corresponding TA update value TA_2.
由于在上述第一种方法中，多个TA更新值包含在同一个MAC控制单元中，因此，多个TA更新值到达UE的时刻相同。Because in the first method above, multiple TA update values are contained in the same MAC control element, therefore, the multiple TA update values arrive at the UE at the same moment.
另外，在MAC控制单元之前还包括逻辑信道标识(LCID)(图未示出)，其作为头部(header)的一部分，用于标识上述MAC控制单元的信息类型，即表明MAC控制单元中的信息为多个TA更新值，UE根据LCID可识别MAC控制单元中每一个比特表示的信息。In addition, a logical channel identifier (LCID) (not shown) is also included before the MAC control unit, which is used as a part of the header to identify the information type of the above MAC control unit, that is, to indicate that the MAC control unit The information is a plurality of TA update values, and the UE can recognize the information represented by each bit in the MAC control element according to the LCID.
第二种方法，eNB配置任意一个下行CC的多个MAC控制单元，每个MAC控制单元携带一个小组对应的TA更新值，并将所述携带TA更新值的每个MAC控制单元发送至UE。In the second method, the eNB configures multiple MAC control elements of any downlink CC, each MAC control element carries a TA update value corresponding to a group, and sends each MAC control element carrying the TA update value to the UE.
多个TA更新值也可以在同一个下行CC的不同MAC控制单元中发送，eNB配置一个下行CC的多个MAC控制单元，MAC控制单元的数量总和可以等于需要携带的TA更新值的个数总和，每一MAC控制单元携带一个小组对应的TA更新值。Multiple TA update values can also be sent in different MAC control units of the same downlink CC. The eNB configures multiple MAC control units of a downlink CC. The sum of the number of MAC control units can be equal to the sum of the number of TA update values that need to be carried , each MAC control element carries a TA update value corresponding to a group.
例如，如果携带的TA更新值为N个，则MAC控制单元的数量总和为N个，其中，每个MAC控制单元为一个字节，每个字节的前两位为该小组的标识，剩余六位为该小组对应的TA更新值。图10为两个TA更新值分别包含在同一个下行CC的两个MAC控制单元的实施例的示意图，如图10所示，MAC控制单元1为一个字节，前两位表示第1小组的标识“00”，剩余六位为第1小组对应的TA更新值TA_1，MAC控制单元2为一个字节，前两位表示第2小组的标识“01”，剩余六位为第2小组对应的TA更新值TA_2。For example, if there are N TA update values carried, the total number of MAC control units is N, where each MAC control unit is one byte, the first two bits of each byte are the identification of the group, and the remaining The six bits are the TA update value corresponding to the group. Figure 10 is a schematic diagram of an embodiment in which two TA update values are respectively contained in two MAC control units in the same downlink CC. As shown in Figure 10,
由于在上述第二种方法中，多个TA更新值包含在不同MAC控制单元中，因此，多个TA更新值到达UE的时刻可能不相同。Since in the above-mentioned second method, multiple TA update values are included in different MAC control elements, therefore, the times at which the multiple TA update values arrive at the UE may be different.
另外，在每一个MAC控制单元之前还包括逻辑信道标识(LCID)(图未示出)，其作为头部(header)的一部分，用于标识上述MAC控制单元的信息类型，UE根据LCID可识别MAC控制单元中每一个比特表示的信息。In addition, each MAC control unit also includes a logical channel identifier (LCID) (not shown in the figure), which is used as a part of the header (header) to identify the information type of the above MAC control unit, and the UE can identify it according to the LCID The information represented by each bit in the MAC control element.
第三种方法，eNB配置多个下行CC的多个MAC控制单元，每个MAC控制单元携带一个小组对应的TA更新值，并将所述携带TA更新值的每个MAC控制单元发送至UE。In the third method, the eNB configures multiple MAC control elements of multiple downlink CCs, each MAC control element carries a TA update value corresponding to a group, and sends each MAC control element carrying the TA update value to the UE.
多个TA更新值也可以在不同下行CC的不同MAC控制单元中发送，eNB配置多个下行CC的多个MAC控制单元，MAC控制单元的数量总和可以等于需要携带的TA更新值的个数总和，每一MAC控制单元携带一个小组对应的TA更新值。Multiple TA update values can also be sent in different MAC control units of different downlink CCs. The eNB configures multiple MAC control units of multiple downlink CCs. The sum of the number of MAC control units can be equal to the sum of the number of TA update values that need to be carried , each MAC control element carries a TA update value corresponding to a group.
例如，如果携带的TA更新值为N个，则MAC控制单元的数量总和为N个，其中，每个MAC控制单元为一个字节，每个字节的前两位为表示该小组的标识，剩余六位为该小组对应的TA更新值。图11为两个TA更新值分别包含在两个下行CC的两个MAC控制单元的实施例的示意图。如图11所示，eNB配置CC1的MAC控制单元1，MAC控制单元1为一个字节，前两位表示第1小组的标识“00”，剩余六位为第1小组对应的TA更新值TA_1。eNB配置CC2的MAC控制单元2，MAC控制单元2为一个字节，前两位表示第2小组的标识“01”，剩余六位为第2小组对应的TA更新值TA_2。For example, if there are N TA update values carried, the total number of MAC control units is N, where each MAC control unit is one byte, and the first two bits of each byte are the identification of the group, The remaining six bits are the TA update value corresponding to the group. FIG. 11 is a schematic diagram of an embodiment in which two TA update values are respectively included in two MAC control elements of two downlink CCs. As shown in Figure 11, the eNB configures the
由于在上述第三种方法中，多个TA更新值包含在不同下行CC的不同MAC控制单元中，因此，多个TA更新值到达UE的时刻可能不相同。Since in the third method above, multiple TA update values are contained in different MAC control elements of different downlink CCs, therefore, the times at which the multiple TA update values arrive at the UE may be different.
另外，在每一个MAC控制单元之前还包括逻辑信道标识(LCID)(图未示出)，其作为头部(header)的一部分，用于标识上述MAC控制单元的信息类型，UE根据LCID可识别MAC控制单元中每一个比特表示的信息。In addition, each MAC control unit also includes a logical channel identifier (LCID) (not shown in the figure), which is used as a part of the header (header) to identify the information type of the above MAC control unit, and the UE can identify it according to the LCID The information represented by each bit in the MAC control element.
至此，本流程结束。So far, this process ends.
综上，在本发明中，eNB将多个上行CC分为多个小组，每个小组所包括的上行CC的数量至少为一个，并将分组信息以及每个上行CC所属小组的标识告知UE，eNB为每个小组配置不同的TA值，UE的每个小组分别通过随机接入过程获取该小组对应的TA值，该小组内每个上行CC将小组对应的TA值作为自身对应的TA值，可见，本发明所提供的方法能够使得一个UE获取多个TA值。To sum up, in the present invention, the eNB divides multiple uplink CCs into multiple groups, and the number of uplink CCs included in each group is at least one, and notifies the UE of the group information and the identity of the group to which each uplink CC belongs, The eNB configures different TA values for each group, and each group of UE obtains the TA value corresponding to the group through the random access process, and each uplink CC in the group uses the TA value corresponding to the group as its corresponding TA value, It can be seen that the method provided by the present invention enables one UE to obtain multiple TA values.
另外，为本发明仍然沿用现有技术中初始TA值传递的方法，以及TA更新值的传递方法，只不过在进行初始TA值传递时，考虑如何以小组为单位将多个TA值传递给UE，在进行TA更新值的传递时，考虑对MAC控制单元的格式进行更改以实现多个TA值的传递，因此，本发明的方案保证了对LTE版本的后向兼容性。In addition, the present invention still uses the method of transferring the initial TA value and the method of transferring the TA update value in the prior art, but when performing the initial TA value transfer, consider how to transfer multiple TA values to the UE in units of groups , when transmitting the TA update value, it is considered to change the format of the MAC control element to realize the transmission of multiple TA values. Therefore, the solution of the present invention ensures the backward compatibility to the LTE version.
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2012109937A1 (en) | 2012-08-23 |
| CN102158948B (en) | 2014-01-15 |
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