CN101841845A - Method for informing uplink shared channel demodulation reference signal sending parameters - Google Patents

Abstract

The invention relates to a method for informing uplink shared channel demodulation reference signal sending parameters in a 3GPP LTE-Advanced system. The method comprises that: when a terminal is just connected to the system or is switched between base stations or needs to switch certain parameters, a base station informs the terminal of signaling information through the informing method, and the terminal determines a CS index and an OCC index and whether to adopt an SGH/SH when sending a reference signal by detecting channel information and the signaling information informed by the base station; and the terminal sends the reference signal according to the parameters. The rule of the method utilizes the existing signaling of LTE Release 8 on the premise that additional signaling is not introduced, so the method has good backward compatibility and saves the signaling overhead.

Description

A kind of Notification Method of uplink shared channel demodulation reference signal sending parameters

Technical field

The present invention relates to 3GPP LTE-Advanced (the senior Long Term Evolution of third generation collaborative project) wireless communication system, be specifically related to be used in the 3GPP LTE-Advanced system Notification Method of uplink shared channel demodulation reference signal sending parameters.

Background technology

LTE-A is the evolution version of LTE, can be to the LTE backward compatibility, and promptly the terminal of LTE Release-8 can be worked in the LTE-A network.The LTE-A system mainly is made up of terminal, base station and core net referring to Fig. 1.The connection of logic or physics can be arranged between the base station as required, and the network that the base station is formed is called wireless access network, is responsible for the Access Layer affairs.The base station is connected with core net, and each base station can be connected with one or more above core net nodes.Core net is responsible for the Non-Access Stratum affairs, such as charging, location management etc.Terminal be meant can with the equipment of network communication, such as mobile phone or laptop computer.

LTE-A requires to meet or exceed all related needs of 3GPP TR 25.913, also will meet or exceed the demand of the IMT-Advanced that ITU-R (International Telecommunications Union-wireless group) proposes (senior international mobile telecommunication system) in addition.These new demands comprise, support wideer frequency spectrum configuration (the highest 100MHz), and higher peak rate (1Gbps) and spectrum efficiency (30bps/Hz).In order to reach these requirements, new technology is introduced in 3GPP meeting suggestion in LTE-A, as strengthening multi-antenna technology, carrier aggregation, cooperative multipoint transmission and relaying forwarding etc.

LTE-A has defined two kinds of frame structures, and shown in Fig. 2 (a) and Fig. 2 (b),Type 1 frame structure is supported the FDD dual-mode, andType 2 frame structures are supported the TDD dual-mode.

Basic resource unit in two kinds of frame structures is that (Resource Element, RE), (Resource Block RB) forms a Resource Unit by OFDM symbol on the time domain and a Resource Block on the frequency domain.

(Demodulation Reference Signal DMRS) takies two symbols of a subframe to uplink demodulation reference signal, equals the bandwidth that is assigned with on the frequency domain.The position of these two symbols under common CP (Cyclic Prefix, Cyclic Prefix) situation, has taken the 4th and the 11st symbol, under expansion CP situation, has taken the 3rd and the 9th and symbol.

Reference signal sequence is produced by following formula:

$r_{u,v}^{\left(\mathrm{\α}\right)}\left(n\right)=e^{\mathrm{j\αn}}{\stackrel{\‾}{r}}_{u,v}\left(n\right),\mathrm{\α}=2\mathrm{\π}{n}_{\mathrm{cs}}/12$

By to the reference signal basic sequence

Cyclic shift (Cyclic Shift, CS), can be (the single user's multiple-input and multiple-output of SU-MIMO in the LTE-A system, Single User Multiple InputMultiple Output) different layers or MU-MIMO (multi-user's multiple-input and multiple-output, Multi-UserMultiple Input Multiple Output) different terminals provides orthogonality, thereby guarantees the performance for estimating channel in different layers/terminal.

Owing to introduced carrier aggregation technology, the situation of a plurality of terminal distribution with unequal bandwidth resources may occur among the LTE-A, this moment, terminal room was no longer set up by the orthogonality of the acquisition of CS.Quadrature mask (Orthogonal Covering Codes, OCC) multiplexing scheme as a supplement, multiply by the OCC of appointment by two time slots to a subframe, the orthogonality of the multiplexing SU-MIMO of high-order can further be provided, and can be MU-MIMO orthogonality between the different terminals is provided, the OCC value be+1 ,+1} and+1 ,-1}.

But under the situation of a plurality of terminal distribution with unequal bandwidth resources, if use OCC to distinguish different MU-MIMO terminals, (Sequence Group Hopping/Sequencehopping SGH/SH) must be closed for group redirect and sequence redirect.

3GPP RAN1 meeting (Draft_ReportWG1#60b_v010) is clear and definite the design basic framework of UL DMRS (Way Forward), following constraint has been done in design to the UL DMRS among the LTE-A: suggestion adopts the CS of reference signal as basic multiplexing scheme in LTE-A, adopts OCC multiplexing scheme as a supplement.

But the problem that following two aspects are still arranged needs to solve:

1, how to notify terminal OCC call number (OCC index) and SGH/SH state, guarantee simultaneously not conflict mutually between them;

2, adopt which kind of signaling mechanism, under the situation of not introducing extra signaling, notify terminal D MRS relevant parameter information.

Industry does not have relevant solution at present.

Summary of the invention

The object of the invention provides the Notification Method that is used for uplink shared channel demodulation reference signal sending parameters in a kind of 3GPP LTE-Advanced system, and it has solved at introducing OCC and has replenished the problems referred to above that multiplexing scheme exists as uplink shared channel demodulation reference signal.

Technical solution of the present invention is:

A kind of Notification Method of uplink shared channel demodulation reference signal sending parameters, it may further comprise the steps:

A) terminal sends request to the base station:

When terminal needed connecting system maybe to need to switch to new base station, terminal sent the request of access; When the business change of terminal or variations, terminal sends the parameter modification request;

B) base station sends response to terminal:

After the base station allows the request of terminal, send permission to terminal and insert response or change response;

C) terminal is to base station transmitting channel condition detection information:

After terminal is received response, down channel is carried out the detection of channel conditions, obtain channel matrix order (Rank Indicator, RI), terminal feeds back to the base station with channel conditions report; The content of this channel conditions report comprises the order of channel matrix;

D) base station is given the terminal distribution resource and is returned signaling, finish notice, thereby terminal can send reference signal and business datum:

The base station takies the channel conditions report of situation and this terminal according to system spectral resources, carry out frequency domain resource scheduling by dispatching algorithm, give this terminal distribution resource, return theDCI Format 0 in the uplink scheduling authorization signaling (Uplink Scheduling Grant) simultaneously, comprise following content:

The CS index of 3 bit lengths,

The Frequency Hopping Flag of 1 bit length (frequency hopping sign);

The base station sends to terminal with this signaling, according to this signaling, base station and terminal withrule 1 andrule 2 as known mechanism:

Rule 1:

The CS index of ground floor is appointed as with the CS index of 3 bits in the base station, and with itself and the following formula of detected RI substitution, formula is implicitly notified the CS index of other layers to terminal as the rule of base station and terminal acquiescence

CS(n)＝(CS+(n-1)×12/RI)mod12

Wherein: n represents the number of plies, n={1 ..., RI}, RI are the order indications that terminal is issued the base station;

Thereby can obtain the CS index of different layers under the SU-MIMO situation;

Rule 2:

If Frequency Hopping is Flag=0, then think the forbidding frequency hopping, SGH/GH maintains the original state constant;

If Frequency Hopping is Flag=1, then think and enable frequency hopping, think that simultaneously terminal is in the unequal bandwidth resources pattern of MU-MIMO, forbid SGH/GH this moment, and adopt OCC to carry out MU-MIMO user and distinguish;

E) terminal sends reference signal and business datum:

Terminal receives the uplink scheduling authorization signaling, makes up reference signal and sends business datum according torule 1 andrule 2, and data are data that this terminal will send, and reference signal is used for the demodulation of supplementary services data and carries out the channel estimating operation.

Advantage of the present invention:

1, the present invention proposes the Notification Method that is used for uplink shared channel demodulation reference signal sending parameters in a kind of 3GPP LTE-Advanced system, according to base station and two all known rules of terminal that the present invention proposes, utilize the transmission parameter of existing signaling terminal uplink demodulation reference signal inLTE Release 8 systems.The effect of this rule has:

1) the CS index of the indicating terminal different layers of implicit expression;

2) whether the indicating terminal of implicit expression changes the SGH/GH state;

3) the OCC index of the indicating terminal of implicit expression;

Thereby under the prerequisite of not introducing extra signaling, utilizedLTE Release 8 existing signalings, had the good backward compatibility characteristic and the signaling consumption of saving.

Description of drawings

Fig. 1 is the LTE-A system schematic;

Fig. 2 (a) is the frame structure of the support FDD dual-mode of LTE-A definition;

Fig. 2 (b) is the frame structure of the support TDD dual-mode of LTE-A definition;

Fig. 3 (a) is a reference signal position view under the common CP pattern of LTE-A definition;

Fig. 3 (b) is a reference signal position view under the expansion CP pattern of LTE-A definition;

Fig. 4 is a schematic flow sheet of the present invention;

Fig. 5 has represented the example under the SU-MIMO pattern scene, obtains each layer CS index according torule 1.

Fig. 6 has represented 4 terminals (UE, User Equipment), the example under the scene that each terminal is 1 layer.

Fig. 7 has represented 2 terminals, the example under the scene that each terminal is 2 layers.

Fig. 8 has represented 2 terminals, the example under the scene that each terminal is 4 layers.

Fig. 9 has represented 3 terminals, and wherein 1 terminal is 1 layer, the example under 2 layers of scene of 2 terminals.

Embodiment

The concrete steps of the Notification Method of uplink shared channel demodulation reference signal sending parameters of the present invention are as follows:

A) terminal sends request to the base station: when terminal needed connecting system maybe to need to switch to new base station, terminal sent the request of access; When the business change of terminal or variations, terminal sends the parameter modification request;

B) base station sends response to terminal: after the base station allows the request of terminal, send permission to terminal and insert response or change response;

C) terminal is to base station transmitting channel condition detection information: after terminal is received response, down channel is carried out the detection of channel conditions, obtain channel matrix order (Rank Indicator, RI), terminal feeds back to the base station with the channel conditions report; The content of this channel conditions report comprises the order of channel matrix;

D) base station is given the terminal distribution resource and is returned signaling, finish notice, thereby terminal can send reference signal and business datum:

The base station takies the channel conditions report of situation and this terminal according to system spectral resources, carry out frequency domain resource scheduling by dispatching algorithm, give this terminal distribution resource, return theDCI Format 0 in the uplink scheduling authorization signaling (Uplink Scheduling Grant) simultaneously, comprise following content:

The CS index of 3 bit lengths,

The Frequency Hopping Flag of 1 bit length (frequency hopping sign);

The base station sends to terminal with this signaling, according to this signaling, base station and terminal withrule 1 andrule 2 as known mechanism:

Rule 1:

The CS index of ground floor is appointed as with the CS index of 3 bits in the base station, and with itself and the following formula of detected RI substitution, formula is implicitly notified the CS index of other layers to terminal as the rule of base station and terminal acquiescence

CS(n)＝(CS+(n-1)×12/RI)mod12

Wherein: n represents the number of plies, n={1 ..., RI}, RI are the order indications that terminal is issued the base station.

Thereby can obtain the CS index of different layers under the SU-MIMO situation;

Rule 2:

If Frequency Hopping is Flag=0, then think the forbidding frequency hopping, SGH/GH maintains the original state constant;

If Frequency Hopping is Flag=1, then think and enable frequency hopping, think that simultaneously terminal is in the unequal bandwidth resources pattern of MU-MIMO, forbid SGH/GH this moment, and adopt OCC to carry out MU-MIMO user and distinguish.

After terminal receives the uplink scheduling authorization signaling, make up reference signal and send business datum according torule 1 andrule 2, data are data that this terminal will send, and reference signal is used for the demodulation of supplementary services data and carries out the channel estimating operation.

The principle of the invention: Notification Method support terminal of the present invention switches when maybe needing to switch some parameter in the system of rigidly connecting or between the base station, the base station is notified to terminal by this Notification Method with signaling information, terminal is by detecting the signaling information of channel information and base station notice, determine the CSindex of terminal when sending reference signal, OCC index, and whether adopt SGH/SH.Terminal sends reference signal according to these parameters.

1.CS?and?RI

3 bit informations of CS field among theDCI format 0 can be used to distinguish different layers, by following principle, make the distance maximization of the cyclic shift distribute to different layers, thereby under the prerequisite that does not increase signaling consumption, guaranteed to introduce behind the OCC best orthogonality between different layers.

CS(n)＝(CS+(n-1)×12/RI)mod12

Wherein: n represents the number of plies, n={1 ..., RI}, RI are the order indications that terminal is issued the base station,

2. frequency hopping identifies (Frequency Hopping Flag)

Under LTE-A MU-MIMO scene, when a plurality of terminal distribution during unequal bandwidth resources, keep the orthogonality of different-bandwidth UE in order to utilize OCC, SGH must be disabled.

According to R1-100262 Analysis and evaluation of UL DM RS design for LTE-Ascenarios (Huawei, Jan.2010), when using OCC to separate the UE of different-bandwidth, have only the joint-detection scheme can be used to estimating channel information, but require to forbid frequency hopping this moment.

Whether the present invention utilizes in the descending control signaling Frequency Hopping Flag (1 bit) among theDCI format 0 to come the indicating terminal of implicit expression to divide and is equipped with unequal bandwidth, thereby utilizes FrequencyHopping Flag (FH flag) replacement SGH state.

If Frequency Hopping is Flag=0, then think the forbidding frequency hopping, SGH/GH maintains the original state constant; If Frequency Hopping is Flag=1, think then and enable frequency hopping that think that simultaneously terminal is in the unequal bandwidth resources pattern of MU-MIMO, the OCC of SGH/GH state=0, and employing at this moment carries out MU-MIMO user and distinguishes;

According to mentioned above principle, can utilize existing signaling among theLTE Release 8, come the generation reference signal of the indicating terminal of implicit expression.

Fig. 5 to Fig. 9 is the mapping relations example that the signaling method of inventing in according to the present invention draws, and terminal and base station can draw OCCindex according to CS index, FH flag, RI by tabling look-up when carrying out Signalling exchange, thereby generate reference signal.

Fig. 5 has represented the example under the SU-MIMO pattern scene, obtains each layer CS index according torule 1.

As user's Rank=1, CS (1)=0;

As user's Rank=2, CS (1)=0, CS (2)=6;

As user's Rank=3, CS (1)=0, CS (2)=4, CS (3)=8;

As user's Rank=4, CS (1)=0, CS (2)=3, CS (3)=6, CS (4)=9;

Fig. 6 has represented at 4 terminals (UE, User Equipment), the example under the scene that each terminal is 1 layer.This moment each terminal RI=1, corresponding 1 the CS index of each terminal.

As the FH of terminal flag=1, the SGH/SH state remains unchanged, and partly tables look-up at equal BW.

The CS index=0 that UE1 receives tables look-up and can get, OCC index=[+1+1];

The CS index=0 that UE2 receives tables look-up and can get, OCC index=[+1+1];

The CS index=0 that UE3 receives tables look-up and can get, OCC index=[+1+1];

The CS index=0 that UE4 receives tables look-up and can get, OCC index=[+1+1];

As the FH of terminal flag=0, partly table look-up at non-equal BW in SGH/SH state=0.

The CS index=0 that UE1 receives tables look-up and can get, OCC index=[+1-1];

The CS index=0 that UE2 receives tables look-up and can get, OCC index=[+1+1];

The CS index=0 that UE3 receives tables look-up and can get, OCC index=[+1-1];

The CS index=0 that UE4 receives tables look-up and can get, OCC index=[+1+1].

Fig. 7 has represented at 2 terminals, the example under the scene that each terminal is 2 layers.This moment RI=2, CS index has two values, respectively the CS index of corresponding 2 layers.

As the FH of terminal flag=1, the SGH/SH state remains unchanged, and partly tables look-up at equal BW.

The CS index=0 that UE1 receives tables look-up and can get, OCC index=[+1+1];

The CS index=6 that UE1 receives tables look-up and can get, OCC index=[+1+1];

The CS index=0 that UE2 receives tables look-up and can get, OCC index=[+1+1];

The CS index=6 that UE2 receives tables look-up and can get, OCC index=[+1+1];

As the FH of terminal flag=0, partly table look-up at non-equal BW in SGH/SH state=0.

The CS index=0 that UE1 receives tables look-up and can get, OCC index=[+1-1];

The CS index=6 that UE1 receives tables look-up and can get, OCC index=[+1-1];

The CS index=0 that UE2 receives tables look-up and can get, OCC index=[+1+1];

The CS index=6 that UE2 receives tables look-up and can get, OCC index=[+1+1].

Fig. 8 has represented at 2 terminals, the example under the scene that each terminal is 4 layers.This moment RI=2, CS index has two values, respectively the CS index of corresponding 4 layers.

As the FH of terminal flag=1, the SGH/SH state remains unchanged, and partly tables look-up at equal BW.

The CS index=0 that UE1 receives tables look-up and can get, OCC index=[+1+1];

The CS index=3 that UE1 receives tables look-up and can get, OCC index=[+1+1];

The CS index=6 that UE1 receives tables look-up and can get, OCC index=[+1+1];

The CS index=9 that UE1 receives tables look-up and can get, OCC index=[+1+1];

The CS index=1 that UE2 receives tables look-up and can get, OCC index=[+1-1];

The CS index=4 that UE2 receives tables look-up and can get, OCC index=[+1-1];

The CS index=7 that UE2 receives tables look-up and can get, OCC index=[+1-1];

The CS index=10 that UE2 receives tables look-up and can get, OCC index=[+1-1];

As the FH of terminal flag=0, partly table look-up at non-equal BW in SGH/SH state=0.

The CS index=0 that UE1 receives tables look-up and can get, OCC index=[+1-1];

The CS index=3 that UE1 receives tables look-up and can get, OCC index=[+1-1];

The CS index=6 that UE1 receives tables look-up and can get, OCC index=[+1-1];

The CS index=9 that UE1 receives tables look-up and can get, OCC index=[+1-1];

The CS index=1 that UE2 receives tables look-up and can get, OCC index=[+1+1];

The CS index=4 that UE2 receives tables look-up and can get, OCC index=[+1+1];

The CS index=7 that UE2 receives tables look-up and can get, OCC index=[+1+1];

The CS index=10 that UE2 receives tables look-up and can get, OCC index=[+1+1].

Fig. 9 has represented 3 terminals, and wherein 1 terminal is 1 layer, the example under 2 layers of scene of 2 terminals.This moment UE1 RI=2, CS index has two values, respectively corresponding 2 layers CS index.The RI=1 of UE2 and UE3, CS index have a value, respectively corresponding 1 layer CS index.As the FH of terminal flag=1, the SGH/SH state remains unchanged, and partly tables look-up at equal BW.

The CS index=0 that UE1 receives tables look-up and can get, OCC index=[+1+1];

The CS index=6 that UE1 receives tables look-up and can get, OCC index=[+1+1];

The CS index=3 that UE2 receives tables look-up and can get, OCC index=[+1+1];

The CS index=9 that UE3 receives tables look-up and can get, OCC index=[+1+1]; As the FH of terminal flag=0, partly table look-up at non-equal BW in SGH/SH state=0.

The CS index=0 that UE1 receives tables look-up and can get, OCC index=[+1-1];

The CS index=6 that UE1 receives tables look-up and can get, OCC index=[+1-1];

The CS index=3 that UE2 receives tables look-up and can get, OCC index=[+1+1];

The CS index=9 that UE3 receives tables look-up and can get, OCC index=[+1+1].

Claims (1)

1. the Notification Method of a uplink shared channel demodulation reference signal sending parameters is characterized in that: may further comprise the steps:

A) terminal sends request to the base station:

When terminal needed connecting system maybe to need to switch to new base station, terminal sent the request of access;

When the business change of terminal or variations, terminal sends the parameter modification request;

B) base station sends response to terminal:

After the base station allows the request of terminal, send permission to terminal and insert response or change response;

C) terminal is to base station transmitting channel condition detection information:

After terminal is received response, down channel is carried out the detection of channel conditions, obtain channel matrix order (Rank Indicator, RI), terminal feeds back to the base station with channel conditions report; The content of this channel conditions report comprises the order of channel matrix;

D) base station is given the terminal distribution resource and is returned signaling, finish notice, thereby terminal can send reference signal and business datum:

The base station takies the channel conditions report of situation and this terminal according to system spectral resources, carry out frequency domain resource scheduling by dispatching algorithm, give this terminal distribution resource, return the DCI Format 0 in the uplink scheduling authorization signaling (Uplink Scheduling Grant) simultaneously, comprise following content:

The CS index of 3 bit lengths,

The Frequency Hopping Flag of 1 bit length (frequency hopping sign);

The base station sends to terminal with this signaling, according to this signaling, base station and terminal with rule 1 and rule 2 as known mechanism:

Rule 1:

The CS index of ground floor is appointed as with the CS index of 3 bits in the base station, and with itself and the following formula of detected RI substitution, formula is implicitly notified the CS index of other layers to terminal as the rule of base station and terminal acquiescence

CS(n)＝(CS+(n-1)×12/RI)mod12

Wherein: n represents the number of plies, n={1 ..., RI}, RI are the order indications that terminal is issued the base station;

Thereby can obtain the CS index of different layers under the SU-MIMO situation;

Rule 2:

If Frequency Hopping is Flag=0, then think the forbidding frequency hopping, SGH/GH maintains the original state constant;

If Frequency Hopping is Flag=1, then think and enable frequency hopping, think that simultaneously terminal is in the unequal bandwidth resources pattern of MU-MIMO, forbid SGH/GH this moment, and adopt OCC to carry out MU-MIMO user and distinguish;

E) terminal sends reference signal and business datum:

Terminal receives the uplink scheduling authorization signaling, makes up reference signal and sends business datum according to rule 1 and rule 2, and data are data that this terminal will send, and reference signal is used for the demodulation of supplementary services data and carries out the channel estimating operation.

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