CN102916768B

CN102916768B - The feedback method of High-Speed Dedicated Physical Control Channel, device and system

Info

Publication number: CN102916768B
Application number: CN201210349134.5A
Authority: CN
Inventors: 铁晓磊; 胡文权; 吴更石; 花梦
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2012-09-19
Filing date: 2012-09-19
Publication date: 2016-06-29
Anticipated expiration: 2032-09-19
Also published as: CN102916768A

Abstract

The embodiment of the present invention provides feedback method and the equipment of a kind of HS-DPCCH.Method includes: base station forwarding network side is handed down to the pattern of the feedback format of UE；Base station receives UE and passes through HS-DPCCH the channel condition information sent according to the pattern of feedback format, order to obtain precoding codebook and precoding codebook is used for performing precoding processing, wherein channel condition information includes the first codebook information and the second codebook information, first codebook information includes the RI of PCI and the first code book of the first code book, second codebook information includes the RI of PCI and the second code book of the second code book, the PCI of PCI and the second code book of the first code book is for determining the precoding codebook of the final utilization of channel precoding processing, the RI of RI and the second code book of the first code book is for determining the order of precoding codebook.Technique scheme can ensure accuracy of feedback information in systems and reduce feedback quantity.

Description

Feedback method, device and system of high-speed dedicated physical control channel

Technical Field

The present invention relates to the field of wireless communication, and more particularly, to a feedback method, apparatus and system for a high speed dedicated physical control channel (HS-DPCCH).

Background

With the development of wireless communication technology, a technical trend of 4-channel multiple input multiple Output (4 branch mimo, 4branch multi-input multi-Output) is proposed. In the 4branch mimo technology, the current channel allows the maximum number of layers supported by downlink spatial multiplexing, that is, the rank of the channel is up to 4 layers (layer), and meanwhile, in the 4branch mimo technology, a multi-Carrier situation of up to 4 carriers (4C in english, 4 Carrier) needs to be supported. Therefore, the feedback mode or format of the HS-DPCCH needs to be designed. In HS-DPCCH, user equipment (UE, english) needs to feed back CQI, RI, PCI, and ACK or combination information of CQI, RI, PCI, and NACK. Wherein the CQI is an abbreviation of english channel qualityindicator, and represents channel quality information; RI is an abbreviation for RankIndication in english, indicating an indication of the rank of the channel; PCI is an abbreviation of Pre-coding indicator in english, and indicates an index value corresponding to a precoding codebook (codebook in english) used for channel precoding processing; ACK is an abbreviation of english ACknowledge, indicating acknowledgement information; NACK is an abbreviation of english Non-ACK, indicating Non-acknowledgement information. In addition, the rank of the precoding codebook is a rank of each TTI (transmission time interval, chinese) of the current downlink transmission used in the channel precoding process.

In addition, in the technical development of wireless communication, a design idea of a dual codebook of a precoding codebook appears. Assuming that the final precoding codebook is W, the construction method of W is:

W=W⁽¹⁾W⁽²⁾formula (1)

Wherein W⁽¹⁾Called the first codebook, reflecting the channel relationship in co-polarized antennas, W⁽²⁾The second codebook represents the relationship between the phase variation and the channel variation between antennas with different polarizations. The main difference between the first codebook and the second codebook is that the first codebook selects a set of beams (beams in english), and the second codebook selects one or more best beams among the set of beams. Thus, the first codebook (W)⁽¹⁾) The update period is long, is a long-term codebook, and the second codebook (W)⁽²⁾) The updating period is short, and the code book is a short-term code book.

As in HS-DPCCH, the information to be fed back is ACK/NACK, CQI, RI and PCI. In 4branch MIMO and higher rank MIMO technologies using a dual codebook, how to ensure feedback information accuracy and reduce feedback amount requires redesign of feedback information of HS-DPCCH.

Disclosure of Invention

In view of this, embodiments of the present invention provide a feedback method for HS-DPCCH, so as to solve the problem of ensuring the accuracy of feedback information and reducing the feedback amount.

In a first aspect, a feedback method for HS-DPCCH is provided, including: a base station transmits a pattern of a feedback format issued to User Equipment (UE) by a network side; the base station receives channel state information sent by the UE through the HS-DPCCH according to a feedback format pattern to acquire a precoding codebook and a rank of the precoding codebook for executing precoding processing, wherein the channel state information comprises first codebook information and second codebook information, the first codebook information comprises a precoding codebook index value PCI of the first codebook and rank information RI of the first codebook, the second codebook information comprises a PCI of the second codebook and the RI of the second codebook, the PCI of the first codebook and the PCI of the second codebook are used for determining the precoding codebook finally used for channel precoding processing, and the RI of the first codebook and the RI of the second codebook are used for determining the rank of the precoding codebook.

In a first possible implementation manner, the pattern of feedback formats includes two feedback formats corresponding to the HS-DPCCH channel in one TTI unit, where the feedback format of the first codebook information and the feedback format of the second codebook information are respectively used to carry the first codebook information and the second codebook information, and in a pattern of feedback formats, the feedback format of the first codebook information is used at least in one specified TTI, and the feedback format of the second codebook information is used at least in one or more specified consecutive TTI units, where a feedback period of the pattern of feedback formats corresponds to a feedback period of the first codebook information, and a feedback period of the first codebook information is longer than a feedback period of the second codebook information.

The second aspect provides a feedback method of HS-DPCCH, comprising that UE receives a pattern of feedback format sent by a base station forwarding network side to the UE; the UE sends channel state information to the base station through an HS-DPCCH channel according to a feedback format pattern received from the base station, wherein the channel state information comprises first codebook information and second codebook information, the first codebook information comprises a precoding codebook index value PCI of a first codebook and rank information RI of the first codebook, the second codebook information comprises a PCI of a second codebook and RI of the second codebook, the PCI of the first codebook and the PCI of the second codebook are used for determining a precoding codebook finally used for channel precoding, and the RI of the first codebook and the RI of the second codebook are used for determining the rank of the precoding codebook.

In a third aspect, a base station is provided, which includes a transmitting unit and a receiving unit: the sending unit is used for forwarding a pattern of a feedback format issued by a network side to User Equipment (UE); the receiving unit is configured to receive channel state information sent by the UE through the high-speed dedicated physical control channel HS-DPCCH according to the feedback format pattern sent by the sending unit to obtain a precoding codebook and a rank of the precoding codebook for performing precoding processing, where the channel state information includes first codebook information and second codebook information, the first codebook information includes a precoding codebook index value PCI of the first codebook and rank information RI of the first codebook, the second codebook information includes a PCI of the second codebook and an RI of the second codebook, the PCI of the first codebook and the PCI of the second codebook are used to determine the precoding codebook finally used for channel precoding processing, and the RI of the first codebook and the RI of the second codebook are used to determine the rank of the precoding codebook.

In a first possible implementation manner, the pattern of feedback formats used by the receiving unit includes two feedback formats corresponding to the HS-DPCCH channel in one TTI unit, where the feedback format of the first codebook information and the feedback format of the second codebook information are respectively used to carry the first codebook information and the second codebook information, and in a pattern of feedback formats, the feedback format of the first codebook information is used at least in one specified TTI and the feedback format of the second codebook information is used at least in one or more specified consecutive TTI units, where a feedback period of the pattern of feedback formats corresponds to a feedback period of the first codebook information, and the feedback period of the first codebook information is longer than a feedback period of the second codebook information.

In a fourth aspect, a UE is provided, which includes a receiving unit and a transmitting unit, and is characterized in that: the receiving unit is used for receiving the pattern of the feedback format issued to the UE by the base station forwarding network side and sending the pattern of the feedback format to the sending unit; a sending unit, configured to send channel state information to the base station through the HS-DPCCH channel according to the pattern of the feedback format received by the receiving unit from the base station, where the channel state information includes first codebook information and second codebook information, the first codebook information includes a precoding codebook index value PCI of the first codebook and rank information RI of the first codebook, the second codebook information includes a PCI of the second codebook and an RI of the second codebook, the PCI of the first codebook and the PCI of the second codebook are used to determine a precoding codebook finally used for channel precoding, and the RI of the first codebook and the RI of the second codebook are used to determine a rank of the precoding codebook.

In a first possible implementation manner, the pattern of feedback formats used by the sending unit includes two feedback formats corresponding to the HS-DPCCH channel in one TTI unit, where the feedback format of the first codebook information and the feedback format of the second codebook information are respectively used to carry the first codebook information and the second codebook information, and in a pattern of feedback formats, the feedback format of the first codebook information is used at least in one specified TTI and the feedback format of the second codebook information is used at least in one or more specified consecutive TTI units, where a feedback period of the pattern of feedback formats corresponds to a feedback period of the first codebook information, and the feedback period of the first codebook information is longer than a feedback period of the second codebook information.

In the embodiment of the invention, the base station receives the channel state information carrying the double codebooks for determining the final precoding codebook, which is periodically fed back according to the pattern of a certain feedback format, and the feedback quantity can be reduced on the premise of ensuring the precision of the feedback information by the feedback mode of combining the long-term codebook information (first codebook information) and the short-term codebook information (second codebook information), thereby saving the air interface resources and improving the system performance.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic block diagram of a feedback method of HS-DPCCH according to a first embodiment of the present invention.

Fig. 2 is a diagram illustrating channel state information according to a second embodiment of the present invention.

Fig. 3 is a diagram illustrating a pattern of a feedback format according to a third embodiment of the present invention.

Fig. 4 is a diagram illustrating another feedback format pattern according to a fourth embodiment of the present invention.

Fig. 5 is a schematic diagram of another feedback format pattern according to a fifth embodiment of the present invention.

Fig. 6 is a diagram illustrating another feedback format according to a sixth embodiment of the present invention.

Fig. 7 is a schematic block diagram of another feedback method of the HS-DPCCH in the seventh embodiment of the present invention.

Fig. 8 is a schematic block diagram of a base station of an eighth embodiment of the present invention.

Fig. 9 is a schematic block diagram of a UE according to a ninth embodiment of the present invention.

Fig. 10 is a schematic block diagram of a base station of a tenth embodiment of the present invention.

Fig. 11 is a schematic block diagram of a UE according to an eleventh embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

Universal Mobile Telecommunications System (UMTS),

the technical scheme of the invention can be applied to UMTS (Universal Mobile Telecommunications System in English, and Universal Mobile communication System in Chinese). User Equipment (UE), also referred to as mobile terminal (mobile terminal), mobile user equipment, etc., may communicate with one or more core networks via a radio access network (e.g., RAN), and may be mobile terminals, such as mobile phones (or "cellular" phones) and computers having mobile terminals, such as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, that exchange voice and/or data with the radio access network. The base station, which may be a base station (NodeB) in UMTS.

Additionally, the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In view of evolution, one of the criteria followed by HSDPA (high speed downlink packet access, chinese) design is to make functional partitioning between functional entities and logic layers defined in the R99 version compatible as much as possible. While maintaining the R99 version structure, a new Media Access Control (MAC) entity MAC-hs is added to the NodeB (base station) to take charge of scheduling, link adjustment, and HARQ (hybrid automatic repeat request, chinese) control. This allows the system to uniformly manage the user handover between HS-PDSCH (high-speed-physical shared data channel, chinese) and dedicated data channel DCH at the Radio Network Controller (RNC). The channels introduced by the HSDPA use the same frequency points as other channels, so that an operator can flexibly configure channel resources according to the actual service condition. The HSDPA channels include the HS-PDSCH and corresponding downlink shared control channel (HS-SCCH) and uplink dedicated physical control channel (HS-DPCCH). The downlink shared control channel (HS-SCCH) carries control information from the MAC-HS to the user equipment including the user equipment identity token, HARQ related parameters and the transport format used by the HS-PDSCH. These pieces of information are transmitted from the base station to the user equipment every 2 ms. The uplink dedicated physical control channel (HS-DPCCH) is then used by the user equipment to report downlink channel quality conditions, i.e., channel state information in context, to the base station and to request the base station to retransmit the data block with errors. Here, the feedback information of the HS-DPCCH is specifically: HARQ-ACK information, CQI information, precoding information PCI and rank information RI when MIMO is used.

In 4branch mimo, the feedback information requirements of the UE include: 2 CQI feedbacks; 2 ACK or NACK (hereinafter abbreviated ACK/NACK) feedbacks. For example, in HSDPA (high speed downlink packet access, chinese) protocol, the TTI is 2ms and consists of three slots. In the HS-DPCCH channel, the first Slot is used for feeding back ACK/NACK, and the last two slots are used for feeding back CQI, PCI and RI. Through the prior art, it can be seen that ACK/NACK in the 4branch MIMO technology can completely multiplex the format design of the first slot of the HS-DPCCH in the 2x2MIMO, and CQI information can also completely multiplex the coding mode in the 2x2MIMO technology. Therefore, in the feedback information of the HS-DPCCH of 4branch mimo, along with the feedback methods of CQI and ACK/NACK in the prior art, the feedback methods of RI and PCI need to be redesigned for the use of the dual codebook.

Also, when HSDPA is extended to 8 transmit and 8 receive antennas, i.e., 8branch mimo, the feedback information on HS-DPCCH is still required to include HARQ-ACK, CQI, PCI, and RI. The HARQ-ACK and CQI can be solved by using a HARQ-ACK and CQI feedback method in a multi-carrier technology, and the feedback of PCI information and RI information can still continue to use the technical scheme of the invention: feeding back PCI and RI information by adopting a mode of first codebook information and second codebook information, wherein the first codebook information comprises a precoding codebook index value PCI of a first codebook and rank information RI of the first codebook, the second codebook information comprises a PCI of a second codebook and RI of the second codebook, the PCI of the first codebook and the PCI of the second codebook are used for determining a precoding codebook used finally in channel precoding processing, and the RI of the first codebook and the RI of the second codebook are used for determining the rank of the precoding codebook; the first codebook and the second codebook have different feedback periods to save feedback signaling overhead. The first codebook and second codebook feedback format patterns used in the present invention can also be used in 8branch mimo systems. Similarly, the scheme of the invention can also be used in a higher-rank MIMO system such as the later 16x16MIMO system.

For convenience of description, the embodiment of the present invention is described only for the 4branchMIMO technology, and proposes a feedback method for HS-DPCCH in the UMTS technology. However, the HS-DPCCH feedback method of the present invention can be used in MIMO systems with 8BranchMIMO and higher rank.

Fig. 1 is a schematic block diagram of a feedback method 10 of HS-DPCCH in a first embodiment of the present invention. The method 10 may be performed by a network side device, such as a base station, and includes the following.

And S11, the base station forwards the pattern of the feedback format issued to the UE by the network side.

S12, the base station receives channel state information sent by the UE through a high-speed dedicated physical control channel (HS-DPCCH) according to a feedback format pattern to acquire a precoding codebook and a rank of the precoding codebook for executing precoding processing, wherein the channel state information includes first codebook information and second codebook information, the first codebook information includes a precoding codebook index value PCI of the first codebook and rank information RI of the first codebook, the second codebook information includes a PCI of the second codebook and an RI of the second codebook, the PCI of the first codebook and the PCI of the second codebook are used for determining the precoding codebook finally used for channel precoding processing, and the RI of the first codebook and the RI of the second codebook are used for determining the rank of the precoding codebook.

The channel state information may include not only RI and PCI, but also CQI and ACK/NACK information.

Here, the first codebook (W)⁽¹⁾) Reflecting the channel relationship in co-polarized antennas is a long-term codebook, a second codebook (W)⁽²⁾) The relationship between the phase change and the channel change of different polarized antennas is shown, and the short-term codebook is formed. The precoding codebook finally used by the base station is jointly determined by the first codebook and the second codebook. Compared with the prior art using one codebook, the feedback information precision can be improved on the premise of the same feedback overhead by using the feedback information reflecting the channel quality of the double codebook. Wherein,the RI of the first codebook reflects whether the rank of the channel finally used ranges from {1 or 2} or {3 or 4}, and in combination with the RI of the second codebook, the channel rank can be finally determined.

In the embodiment of the invention, the base station receives the channel state information carrying the double codebooks for determining the final precoding codebook, which is periodically fed back according to the pattern of a certain feedback format, and the feedback quantity can be reduced on the premise of ensuring the precision of the feedback information by the feedback mode of combining the long-term codebook information (first codebook information) and the short-term codebook information (second codebook information), thereby saving the air interface resources and improving the system performance. As a prior art, a base station broadcasts a common pilot channel (CPICH for short), and transmits HS-PDSCH and HS-SCCH to a UE. And the UE performs channel estimation according to the received signal of the CPICH channel to obtain channel state information.

Based on the foregoing method, optionally, as another embodiment, the pattern of the feedback formats includes two feedback formats corresponding to the HS-DPCCH channel in one TTI unit, where a feedback format of the first codebook information and a feedback format of the second codebook information are respectively used to carry the first codebook information and the second codebook information, and in a pattern of one feedback format, the feedback format of the first codebook information is used at least in one specified TTI and the feedback format of the second codebook information is used at least in one or more specified consecutive TTI units, where a feedback period of the pattern of the feedback formats corresponds to a feedback period of the first codebook information, and the feedback period of the first codebook information is longer than the feedback period of the second codebook information.

Based on the foregoing method, optionally, as another embodiment, the feedback format of the first codebook information specifically includes: the feedback format of the first codebook information only includes the encoded PCI of the first codebook, and it can be determined that the rank of the precoding codebook indicated by the RI of the first codebook is within {1 or 2} or within {3 or 4} by the PCI of the first codebook.

Based on the foregoing method, optionally, as another embodiment, the feedback format of the second codebook information specifically includes: if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {1 or 2}, the feedback format of the second codebook information only includes the PCI of the second codebook after encoding, and the rank of the precoding codebook of the second codebook is determined to be specifically 1 or specifically 2 by the specific value of the TYPEA-type CQI, or if the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {3 or 4}, the second codebook information includes the PCI of the second codebook after encoding and the RI of the second codebook, and the RI of the second codebook is expressed by 1bit for indicating whether the rank of the precoding codebook is specifically 3 or 4.

Or, based on the foregoing method, optionally, as another embodiment, the feedback format of the second codebook information specifically includes: if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {1 or 2}, the second codebook information includes the PCI of the encoded second codebook and the RI of the second codebook, and the RI of the second codebook is expressed by 1bit for indicating that the rank of the precoding codebook is specifically 1 or 2, or if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {3 or 4}, the second codebook information includes the PCI of the encoded second codebook and the RI of the second codebook, and the RI of the second codebook is expressed by 1bit for indicating that the rank of the precoding codebook is specifically 3 or 4.

In the foregoing method, as another embodiment, the using the PCI of the first codebook and the PCI of the second codebook to determine a precoding codebook for channel precoding processing includes: and taking the product of a first codebook which can be determined by the first codebook information PCI and a second codebook corresponding to the second codebook information PCI as a precoding codebook finally used in each TTI during downlink transmission, wherein the RI of the first codebook indicates the range of the rank of the precoding codebook in a feedback period corresponding to the first codebook information, and further indicates the specific rank of the precoding codebook in each feedback period of the second codebook information according to the RI of the first codebook and the RI of the second codebook.

Or, based on the foregoing method, optionally, as another embodiment, the feedback format of the second codebook information specifically includes: the second codebook information includes a PCI of the encoded second codebook and an RI of the second codebook if the first codebook RI indicates that a range of a rank of the precoding codebook in a feedback period corresponding to the first codebook information is within {1 or 2}, and the RI of the second codebook is expressed by 1bit for indicating that the rank of the precoding codebook is specifically 1 or 2, or the second codebook information includes a PCI of the encoded second codebook and an RI of the second codebook if the first codebook RI indicates that a range of a rank of the precoding codebook in a feedback period corresponding to the first codebook information is within {3 or 4}, and the RI of the second codebook is expressed by 2 bit for indicating that the rank of the precoding codebook is specifically one of 1 to 4.

In the foregoing method, as another embodiment, the using the PCI of the first codebook and the PCI of the second codebook to determine a precoding codebook to be finally used for channel precoding processing includes: if the first codebook RI indicates that the rank of the precoding codebook in the feedback period corresponding to the first codebook information is in the range of {1 or 2}, alternatively, if the first codebook RI indicates that the rank of the precoding codebook in the feedback period corresponding to the first codebook information is in the range of {3 or 4}, and the 2-bit second codebook RI indicates that the specific rank of the channel is still within 3 or 4, the product of a first codebook that can be determined by the first codebook information PCI and a second codebook corresponding to the second codebook information PCI is a precoding codebook to be finally used, the RI of the first codebook indicates a range of a rank of a precoding codebook within a feedback period corresponding to the first codebook information, according to the RI of the first codebook and the RI of the second codebook, the rank of a specific precoding codebook in a feedback period of each second codebook information is further indicated; if the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is indicated by the first codebook RI is within {3 or 4} and the specific rank of the 2-bit second codebook RI indicated channel is within {1 or 2}, the rank of the precoding codebook is the rank information specifically indicated by the second codebook RI, a column of column vectors are extracted from the first two columns of the first codebook and a column of two vectors are also extracted from the last two columns of the first codebook, the extracted two columns of column vectors form a new first codebook, and the new first codebook is multiplied by a precoding matrix corresponding to the PCI included in the second codebook information to serve as a final precoding matrix.

Or, optionally, as another embodiment, a feedback format of the second codebook information specifically includes: if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {1 or 2}, the second codebook information includes the PCI of the encoded second codebook and the RI of the second codebook, and the RI of the second codebook is expressed by 1bit for indicating that the rank of the precoding codebook is specifically 1 or 2, or if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {3 or 4}, the pattern of the feedback formats includes at least two second codebook information feedback formats, a first second codebook format and a second codebook format, wherein the first second codebook information feedback format is used for indicating the PCI and PCI information of the second codebook when the rank of the precoding codebook is specifically 3 or 4, and the second codebook information feedback format is used for indicating the first codebook when the rank of the codebook is specifically 1 or 2 PCI and RI information of the two codebooks.

In the above method, optionally, as another embodiment, if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {1 or 2}, alternatively, if the first codebook RI indicates that the rank of the precoding codebook in the feedback period corresponding to the first codebook information is in the range of {3 or 4}, and when the feedback format on the corresponding TTI is a first second codebook feedback format, the product of a first codebook that can be determined by the first codebook information PCI and a second codebook corresponding to the second codebook information PCI is a finally used precoding codebook, the RI of the first codebook indicates a range of a rank of a precoding codebook within a feedback period corresponding to the first codebook information, the RI of the second codebook in the range further indicates the rank of the specific precoding codebook in each feedback period of the second codebook information; if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is in {3 or 4} and the feedback format corresponding to the TTI is the second codebook feedback format, the rank of the precoding codebook is the specifically indicated rank information in the second codebook feedback format, a column of column vectors is extracted from the first two columns of the first codebook and a column of two vectors is also extracted from the last two columns of the first codebook, the extracted two columns of column vectors form a new first codebook, and the new first codebook is multiplied by the precoding matrix corresponding to the PCI included in the second codebook information to be used as the final precoding matrix.

Fig. 2 is a diagram of channel state information 20 according to a second embodiment of the present invention.

As shown in fig. 2, the channel state information 20 fed back periodically according to a pattern of a feedback format (pattern), includes ACK/NACK feedback 21, CQI feedback 22, RI feedback 23, PCI feedback 24, and the like.

In the prior art, the existing CQI feedback format of format a (TYPEA) satisfies the feedback of 2 CQIs, and the feedback of 2 ACKs/NACKs can also be designed by multiplexing the existing ACK/NACK feedback of the first slot. Therefore, if the 4branch mimo uses the dual codebook technology, in the HS-DPCCH feedback design, the feedback 22 of CQI follows TYPEA, and the feedback 21 of ACK/NACK follows the prior art, and on the basis of this, new feedback formats of RI and PCI are introduced, mainly used for the feedback 23 of RI and the feedback 24 of PCI. A variety of information is contained in the pattern of the feedback format configured by the base station. For example, the feedback period of the pattern of the feedback format is used to indicate how long the UE sends the channel state information to the base station according to the pattern of the feedback format; the feedback format pattern includes feedback formats of which channel state information is included, for example, feedback formats of ACK/NACK, CQI, RI, and PCI may be included; what the feedback period is for each feedback format; and what the specific coding scheme is for each feedback format, etc.

In the following pattern of the feedback format according to the embodiment of the present invention, the description of the feedback format of ACK/NACK and CQI is omitted to highlight the feedback format of RI and PCI in the embodiment of the present invention. The pattern of the feedback format may be carried by an RRC (radio resource control, chinese) signaling configured by a network side, for example, a Radio Network Controller (RNC). And the base station obtains the RRC signaling carrying the pattern of the feedback format from the RNC and forwards the RRC signaling to the UE. Because the embodiment of the invention adopts the dual codebook technology, the channel state information comprises the first codebook information and the second codebook information, the first codebook information comprises the PCI of the first codebook and the RI of the first codebook, the second codebook information comprises the PCI of the second codebook and the RI of the second codebook, the PCI of the first codebook and the PCI of the second codebook are used for determining the finally used precoding codebook for channel precoding processing, and the RI of the first codebook and the RI of the second codebook are used for determining the rank of the precoding codebook. The feedback manner of the information included in the first codebook information and the second codebook information, such as PCI and RI, may be explicit or implicit. The information can be directly obtained through the information-based display feedback mode, and the information can be indirectly obtained through other known information through the information-based implicit feedback mode without explicit bit feedback. The feedback format pattern comprises two feedback formats corresponding to the HS-DPCCH in a TTI unit, the feedback format of the first codebook information and the feedback format of the second codebook information are respectively used for bearing the first codebook information and the second codebook information, the feedback format of the first codebook information can be used at least on a specified TTI in one feedback format pattern, and the feedback format of the second codebook information can be used at least on one or more specified continuous TTI units, wherein the feedback cycle of the feedback format pattern corresponds to the feedback cycle of the first codebook information, and the feedback cycle of the first codebook information is longer than the feedback cycle of the second codebook information. Compared with the mode of directly feeding back a single precoding codebook in the prior art, the base station can make full use of the double-codebook technology by the method for configuring the pattern of the feedback format, improve the feedback precision and reduce the feedback quantity. The feedback period of the pattern of the feedback format corresponds to a feedback period of the first codebook information, and may include that the length of the pattern of the feedback format is an integer multiple of the feedback period of the first codebook information. When the integer multiple is 1, a feedback period of the pattern of the feedback format is equal to a feedback period of the first codebook information.

In the following embodiments, for the sake of brevity, feedback contents such as feedback formats of the feedback 21 of ACK/NACK and the feedback 22 of CQI are omitted from the feedback formats, and only patterns of specific feedback formats including the feedback 23 of RI and the feedback 24 of PCI are shown. Since the first codebook and the second codebook are used in the technique of the embodiment of the present invention, the feedback 23 of RI and the feedback 24 of PCI are also used to correspond to different codebooks, respectively, and are referred to as first codebook information 31 and second codebook information 32, respectively, in this context. The first codebook information 31 includes the PCI of the first codebook and the RI of the first codebook, and the second codebook information 32 includes the PCI of the second codebook and the RI of the second codebook. In the first codebook information, the PCI of the first codebook and the RI of the first codebook may be commonly encoded. In the second codebook information, the PCI of the second codebook and the RI of the second codebook may be commonly encoded.

Currently, according to the codebook design of the prior art, when the rank of the precoding codebook determined by the first codebook RI is in the range of {1 or 2} and {3 or 4}, the dimension of the precoding matrix is not the same. When the rank of the precoding codebook is within {1 or 2}, the first codebook is a 4x2 matrix, and when the rank of the precoding codebook is within {3 or 4}, the first codebook is a 4x4 matrix. Generally, the rank information of the second codebook should fall within the rank information of the first codebook. By utilizing the characteristic, when the PCI of the first codebook is fed back, the RI of the first codebook is implicitly fed back at the same time, namely, whether the rank of the precoding codebook is in {1 or 2} or {3 or 4} is distinguished. For example, when the PCI value of the fed back first codebook is in the range of 0 to X, the PCI of the first codebook corresponds to the first codebook having the rank of the precoding codebook in the range of {1 or 2}, and when the PCI value of the fed back first codebook is in the range of X to Y, the PCI of the first codebook corresponds to the first codebook having the rank of the precoding codebook in the range of {3 or 4}, where X and Y are positive integers, and Y is the largest PCI value. Therefore, based on the above characteristics, only the PCI of the first codebook may be encoded in the feedback format of the first codebook information, thereby reducing the number of RI feedback bits of the first codebook. This feedback format of the first codebook information is called TYPEC, and the embodiments of the present invention described below apply.

Fig. 3 is a schematic diagram of a pattern 30 in a feedback format according to a third embodiment of the present invention. For convenience of illustration, two consecutive HS-DPCCH feedback periods 33 and 34 are illustrated in fig. 3, each feedback period including two feedback formats corresponding to the HS-DPCCH channel in one TTI unit: a feedback format of the first codebook information and a feedback format of the second codebook information.

A feedback cycle of the pattern 30 of one feedback format includes one first codebook information 31 corresponding to one TTI unit and a plurality of consecutive second codebook information 32 corresponding to one TTI unit, respectively. The first codebook information 31 is fed back in a feedback format of the first codebook information, and the second codebook information 32 is fed back in a feedback format of the second codebook information. Although it is shown in the pattern 30 that the feedback format of one TTI unit in the feedback period is defined as the feedback format of the first codebook information, and the feedback formats of the remaining TTIs are defined as the feedback format of the second codebook information, this is only an example of the present invention. In general, since the first codebook is a long-term codebook and the second codebook is a short-term codebook, in order to improve feedback accuracy, a feedback period of the second codebook information is shorter than a feedback period of the first codebook information. The network side, such as an RNC (radio network controller), determines how many TTI units in a pattern of a specifically configured feedback format are used for feeding back the first codebook information, and what the feedback period is; how many TTI units are used for feeding back the second codebook information, and how many feedback periods are.

The RI of the first codebook is known to include two possibilities through the PCI of the first codebook, so that there are the following two possibilities when feeding back the second codebook information.

If the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is {1 or 2}, the feedback format of the second codebook information only needs to include the PCI of the second codebook after encoding, and the rank of the precoding codebook can be determined to be 1 or 2 specifically by the specific value of the TYPEA-type CQI, that is, it is known in an implicit manner that the RI of the second codebook indicates that the rank of the precoding codebook is 1 or 2 specifically. Since the RI of the second codebook can be known in an implicit manner, it is not necessary to perform coding feedback. For example, if the specific value of the CQI of the TYPEA type is in a range of 0 to M, the rank of the precoding codebook is 1, and if the value is in the range of M to N, the rank of the precoding codebook is {2, 3, or 4}, and it is determined that the range of the rank indicated by the first codebook is in {1 or 2}, it may be finally determined that the rank of the precoding codebook is specifically 1 or specifically 2. Where M and N are positive integers and N is the maximum value that is desirable for CQI. For convenience of illustration, the feedback formats of the first codebook information and the second codebook information are represented by different filling manners. The feedback format of the second codebook information is referred to as TYPED (type D).

If the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is {3 or 4}, the rank of the precoding codebook cannot be determined by the TYPEA-type CQI, the second codebook information includes not only the PCI of the second codebook but also the RI of the second codebook, and the RI of the second codebook is expressed by 1bit to indicate that the rank of the precoding codebook is specifically 3 or 4. The feedback format of the second codebook information is referred to as TYPEG.

In this embodiment of the present invention, in the second codebook information, the PCI of the second codebook may be a PCI corresponding to the second codebook when the rank of the precoding codebook is any one of 1 to 4. According to the above feedback format, when the rank of the precoding codebook is 1 or 2, because the RI of the second codebook is not fed back, the number of bits available for feeding back the PCI in the second codebook information is 1bit more than the number of bits available for feeding back the PCI when the rank is 3 or 4, which means that under the design of the present scheme, the number of PCIs of the second codebook when the rank of the precoding codebook available for feeding back is 1 or 2 is twice more than the number of PCIs of the second codebook when the rank of the precoding codebook is 3 or 4, that is, the former has better quantization precision than the latter. Optionally, the channel state information fed back by the pattern 30 in the feedback format in one feedback period includes at least one first codebook information 31 and a plurality of second codebook information 32. The feedback formats of all the second codebook information are the same, or are TYPED or TYPEG, and the feedback contents are different corresponding to different TTIs. For convenience of illustration, two feedback periods in the pattern 30 of the feedback format are exemplarily used to indicate the feedback format of the second codebook information in different situations where two TTIs correspond.

Alternatively, fig. 4 is a schematic diagram of a pattern 40 in another feedback format according to a fourth embodiment of the present invention. The pattern 40 of the feedback format is different from the pattern 30 of the feedback format in that the feedback format of the second codebook information is configured differently.

Since the RI of the first codebook is known to include two possibilities through the PCI of the first codebook, there are the following two possible cases when feeding back the second codebook information.

If the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is {1 or 2}, the second codebook information includes the PCI of the encoded second codebook and the RI of the second codebook, and the RI of the second codebook is expressed by 1bit for indicating that the rank of the precoding codebook is specifically 1 or 2. The feedback format of the second codebook is referred to as TYPEE.

Or, if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is {3 or 4}, the second codebook information includes the PCI of the encoded second codebook and the RI of the second codebook, and the RI of the second codebook is expressed by 1bit for indicating whether the rank of the precoding codebook is specifically 3 or 4. The feedback format of the second codebook is still TYPEG.

In one feedback period, the channel state information fed back in the pattern 40 in the feedback format includes at least one first codebook information 31 and a plurality of second codebook information 32. All the second codebook information have the same feedback format, or are TYPEE or TYPEG, and the feedback content is different corresponding to different TTIs. For convenience of illustration, two feedback periods in the pattern 40 of the feedback format are exemplarily used to indicate the feedback format of the second codebook information in different situations where two TTIs correspond.

After receiving the first codebook information and the second codebook information sent by the feedback format based pattern 30 or 40, the base station further obtains a precoding codebook finally used in each TTI during downlink transmission by a product of the first codebook determined by the PCI of the first codebook information and the second codebook determined by the PCI of the second codebook information. The RI of the first codebook indicates a range of a rank of a precoding codebook in a feedback period of the corresponding first codebook information, and within the range, the obtained RI of the second codebook further indicates a specific rank of the precoding codebook in each feedback period of the second codebook information.

Alternatively, fig. 5 is a schematic diagram of a pattern 50 in another feedback format according to a fifth embodiment of the present invention. The pattern 50 of the feedback format is different from the pattern 30 or 40 of the feedback format in that the feedback format of the second codebook information is configured differently.

If the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is {1 or 2}, the second codebook information includes the PCI of the second codebook and the RI of the second codebook after encoding, and the RI of the second codebook is expressed by 1bit for indicating that the rank of the precoding codebook is specifically 1 or 2. The feedback format of the second codebook is still TYPEE. Or, if the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is {3 or 4}, the second codebook information includes the PCI of the second codebook and the RI of the second codebook after encoding, and the RI of the second codebook is expressed by 2 bits for indicating that the rank of the precoding codebook is specifically a specific one of 1 to 4. The feedback format of the second codebook described above is called TYPEF.

In one feedback period, the channel state information fed back in the pattern 50 of the feedback format includes at least one first codebook information 31 and a plurality of second codebook information 32. All the second codebook information have the same feedback format, or are TYPEE or TYPEF, and the feedback content is different corresponding to different TTIs. For convenience of illustration, two feedback periods in the pattern 40 of the feedback format are exemplarily used to indicate the feedback format of the second codebook information in different situations where two TTIs correspond.

After receiving the first codebook information and the second codebook information sent by the feedback format based pattern 50, the base station further obtains a final precoding codebook through a first codebook determined by the PCI of the first codebook information and a second codebook determined by the PCI of the second codebook information.

If the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {1 or 2}, or if the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {3 or 4}, and if the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is still within {3 or 4}, the product of the first codebook determined by the first codebook information PCI and the second codebook corresponding to the second codebook information PCI is the finally used precoding codebook, the RI of the first codebook indicates the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information, and the RI of the second codebook further indicates the specific codebook rank of the precoding codebook in each feedback period of the second codebook information in the range.

If the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is in {3 or 4} and the 2-bit second codebook RI indicates that the specific rank of the channel is in {1 or 2}, the rank of the precoding codebook is the rank information specifically indicated by the second codebook RI, a column of column vectors are extracted from the first two columns of the first codebook and a column of two vectors are also extracted from the last two columns of the first codebook, the two columns of the extracted column vectors form a new first codebook, and the new first codebook is multiplied by the precoding codebook corresponding to the PCI included in the second codebook information to be used as a final precoding codebook.

Alternatively, fig. 6 is a schematic diagram of a pattern 60 in another feedback format according to a sixth embodiment of the present invention. The pattern 60 of the feedback format is different from the pattern 30, 40 or 50 of the feedback format in that the feedback format of the second codebook information is configured differently.

If the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is {1 or 2}, the second codebook information includes the PCI of the second codebook after encoding and the RI of the second codebook, and the RI of the second codebook is expressed by 1bit for indicating that the rank of the precoding codebook is specifically 1 or 2. The feedback format of the second codebook is still TYPEE. At this time, referring to the second feedback period of fig. 6, the channel state information fed back in the pattern 60 of the feedback format includes at least one first codebook information 31 and a plurality of second codebook information 32. The feedback formats of all the second codebook information in the second codebook information are the same as TYPEE.

If the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {3 or 4}, the feedback format pattern at least includes two second codebook information feedback formats, a first second codebook format and a second codebook format, where the first second codebook information feedback format, for example, TYPEG, is used to indicate the second codebook RI and PCI information when the rank of the precoding codebook is specifically 3 or 4, and the second codebook information feedback format, for example, TYPEE, is used to indicate the PCI and RI information of the second codebook when the rank of the precoding codebook is specifically 1 or 2. At this time, referring to the first feedback period of fig. 6, the channel state information fed back in the pattern 60 of the feedback format includes at least one first codebook information 31 and a plurality of second codebook information 32. A part of the second codebook information is fed back through the first feedback format, and at least a part of the second codebook information is fed back through the second feedback format. The feedback formats of the second codebook information in the first feedback period in fig. 6 include two formats, TYPEE and TYPEG, for supporting rank backoff. Rank backoff refers to when the base station does not have enough data to transmit, e.g., while it is appropriate to use rank 3 or 4 on the channel, it may use rank 1 or rank 2 for data transmission. Referring to fig. 6, in the above-described embodiment scheme, fallback from when the rank of the precoding codebook indicated in the first feedback period is specifically 3 or 4 to the rank of the precoding codebook indicated in the second feedback period is specifically 1 or 2, for example, is supported. With the development of the technology, when the rank of the precoding codebook is allowed to be more than two layers or even 4 layers, the method supports a more flexible data transmission mode.

After receiving the first codebook information and the second codebook information sent by the feedback format-based pattern 60, the base station further obtains a final precoding codebook through a first codebook determined by the PCI of the first codebook information and a second codebook determined by the PCI of the second codebook information.

If the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {1 or 2}, or if the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {3 or 4}, and the feedback format on the corresponding TTI is the first second codebook feedback format, the product of the first codebook determined by the first codebook information PCI and the second codebook corresponding to the second codebook information PCI is the precoding codebook to be finally used, the RI of the first codebook indicates the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information, and the RI of the second codebook in the range further indicates the specific rank of the precoding codebook in each feedback period of the second codebook information;

if the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {3 or 4} and the feedback format corresponding to the TTI is a second codebook feedback format, the rank of the precoding codebook is the specifically indicated rank information in the second codebook feedback format, a column of vectors is extracted from the first two columns of the first codebook and a column of two vectors is also extracted from the last two columns of the first codebook, the extracted two columns of vectors form a new first codebook, and the new first codebook is multiplied by the precoding codebook corresponding to the PCI included in the second codebook information to be used as the final precoding codebook.

Fig. 7 is a schematic block diagram of another feedback method 70 for HS-DPCCH in a seventh embodiment of the present invention. The method 70 may be performed by a terminal side, such as a user equipment, including the following.

S71, the UE receives the feedback format pattern sent to the UE by the base station forwarding network side.

S72, the UE sends channel state information to the base station according to the feedback format pattern received from the base station through the HS-DPCCH, wherein the channel state information includes first codebook information of a long-term codebook and second codebook information of a short-term codebook, the first codebook information includes a precoding codebook index value (PCI) of the first codebook and Rank Information (RI) of the first codebook, the second codebook information includes a PCI of the second codebook and an RI of the second codebook, the PCI of the first codebook and the PCI of the second codebook are used for determining a finally used codebook for channel precoding, and the RI of the first codebook and the RI of the second codebook are used for determining a rank of the precoding codebook.

Here, the first codebook (W)⁽¹⁾) Reflecting the channel relationship in co-polarized antennas is a long-term codebook, a second codebook (W)⁽²⁾) The relationship between the phase change and the channel change of different polarized antennas is shown, and the short-term codebook is formed. The precoding codebook finally used by the base station is jointly determined by the first codebook and the second codebook. Compared with the prior art using one codebook, the feedback information precision can be improved on the premise of the same feedback overhead by using the feedback information reflecting the channel quality of the double codebook. Wherein, the RI of the first codebook reflects whether the range of the final used rank of the channel is {1 or 2} or {3 or 4}, and can be combined with the RI of the second codebookIt is possible to finally determine the channel rank.

The feedback format patterns used by the UE may refer to the feedback format patterns in the first to sixth embodiments, and for brevity, are not described herein again. The feedback format pattern comprises two feedback formats corresponding to an HS-DPCCH channel in a TTI unit, wherein the feedback format of first codebook information and the feedback format of second codebook information are respectively used for bearing the first codebook information and the second codebook information, the feedback format of the first codebook information is used at least in one appointed TTI, and the feedback format of the second codebook information is used at least in one or more appointed continuous TTI units, wherein the feedback cycle of the feedback format pattern corresponds to the feedback cycle of the first codebook information, and the feedback cycle of the first codebook information is longer than the feedback cycle of the second codebook information.

In the embodiment of the invention, the UE periodically sends the channel state information carrying the double codebooks for determining the final precoding codebook according to the pattern of a certain feedback format, and the feedback quantity can be reduced on the premise of ensuring the precision of the feedback information by the feedback mode of combining the long-term codebook information (first codebook information) and the short-term codebook information (second codebook information), thereby saving the air interface resources and improving the system performance.

Fig. 8 is a schematic block diagram of a base station 80 according to an eighth embodiment of the present invention. The base station 80 includes a transmitting unit 81 and a receiving unit 82.

The sending unit 81 forwards a pattern of a feedback format issued by the network side to the UE.

The receiving unit 82 receives channel state information sent by the UE through a high-speed dedicated physical control channel HS-DPCCH and according to a feedback format pattern sent by the sending unit 81 to obtain a precoding codebook and rank information of the precoding codebook for performing precoding processing, where the channel state information includes first codebook information and second codebook information, the first codebook information includes a precoding codebook index value PCI of the first codebook and rank information RI of the first codebook, the second codebook information includes a PCI of the second codebook and an RI of the second codebook, the PCI of the first codebook and the PCI of the second codebook are used to determine a precoding codebook to be finally used for channel precoding processing, and the RI of the first codebook and the RI of the second codebook are used to determine a rank of the precoding codebook.

Alternatively, according to another embodiment of the present invention, the pattern of the feedback format used by the receiving unit 82 or used by the transmitting unit 81 may include the pattern of the feedback format in the third to sixth embodiments of the present invention. The feedback format pattern comprises two feedback formats corresponding to an HS-DPCCH channel in a TTI unit, wherein the feedback format of first codebook information and the feedback format of second codebook information are respectively used for bearing the first codebook information and the second codebook information, the feedback format of the first codebook information is used at least in one appointed TTI, and the feedback format of the second codebook information is used at least in one or more appointed continuous TTI units, wherein the feedback cycle of the feedback format pattern corresponds to the feedback cycle of the first codebook information, and the feedback cycle of the first codebook information is longer than the feedback cycle of the second codebook information.

The feedback format of the first codebook information specifically includes: the feedback format of the first codebook information only includes the encoded PCI of the first codebook, and it can be determined that the rank of the precoding codebook indicated by the RI of the first codebook is within {1 or 2} or within {3 or 4} by the PCI of the first codebook.

The feedback formats of the second codebook information are specifically the following ones, and for the contents carried by different feedback formats, the contents of the precoding codebook acquired by the base station 80 and the rank of the precoding codebook for performing precoding processing are slightly different.

The feedback format of the second codebook information specifically includes: if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {1 or 2}, the feedback format of the second codebook information only includes the PCI of the second codebook after encoding, and the rank of the precoding codebook of the second codebook is determined to be specifically 1 or specifically 2 by the specific value of the TYPEA-type CQI, or if the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {3 or 4}, the second codebook information includes the PCI of the second codebook after encoding and the RI of the second codebook, and the RI of the second codebook is expressed by 1bit for indicating whether the rank of the precoding codebook is specifically 3 or 4.

The feedback format of the second codebook information specifically includes: if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {1 or 2}, the second codebook information includes the PCI of the encoded second codebook and the RI of the second codebook, and the RI of the second codebook is expressed by 1bit for indicating that the rank of the precoding codebook is specifically 1 or 2, or if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {3 or 4}, the second codebook information includes the PCI of the encoded second codebook and the RI of the second codebook, and the RI of the second codebook is expressed by 1bit for indicating that the rank of the precoding codebook is specifically 3 or 4.

The base station 80 uses a product of a first codebook that can be determined by the first codebook information PCI and a second codebook corresponding to the second codebook information PCI as a precoding codebook to be finally used in each TTI during downlink transmission, where an RI of the first codebook indicates a range of a rank of the precoding codebook in a feedback period corresponding to the first codebook information, and further indicates a specific rank of the precoding codebook in a feedback period of each second codebook information according to the RI of the first codebook and the RI of the second codebook.

The feedback format of the second codebook information specifically includes: the second codebook information includes a PCI of the encoded second codebook and an RI of the second codebook if the first codebook RI indicates that a range of a rank of the precoding codebook in a feedback period corresponding to the first codebook information is within {1 or 2}, and the RI of the second codebook is expressed by 1bit for indicating that the rank of the precoding codebook is specifically 1 or 2, or the second codebook information includes a PCI of the encoded second codebook and an RI of the second codebook if the first codebook RI indicates that a range of a rank of the precoding codebook in a feedback period corresponding to the first codebook information is within {3 or 4}, and the RI of the second codebook is expressed by 2 bit for indicating that the rank of the precoding codebook is specifically one of 1 to 4.

The contents of the base station 80 acquiring the precoding codebook and the rank of the precoding codebook for performing the precoding processing are as follows.

If the first codebook RI indicates that the rank of the precoding codebook in the feedback period corresponding to the first codebook information is in the range of {1 or 2}, alternatively, if the first codebook RI indicates that the rank of the precoding codebook in the feedback period corresponding to the first codebook information is in the range of {3 or 4}, and the 2-bit second codebook RI indicates that the specific rank of the channel is still within 3 or 4, the product of a first codebook that can be determined by the first codebook information PCI and a second codebook corresponding to the second codebook information PCI is a precoding codebook to be finally used, the RI of the first codebook indicates a range of a rank of a precoding codebook within a feedback period corresponding to the first codebook information, according to the RI of the first codebook and the RI of the second codebook, the rank of a specific precoding codebook in a feedback period of each second codebook information is further indicated;

if the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is indicated by the first codebook RI is within {3 or 4} and the specific rank of the 2-bit second codebook RI indicated channel is within {1 or 2}, the rank of the precoding codebook is the rank information specifically indicated by the second codebook RI, a column of column vectors are extracted from the first two columns of the first codebook and a column of two vectors are also extracted from the last two columns of the first codebook, the extracted two columns of column vectors form a new first codebook, and the new first codebook is multiplied by a precoding matrix corresponding to the PCI included in the second codebook information to serve as a final precoding matrix.

The feedback format of the second codebook information specifically includes: if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {1 or 2}, the second codebook information includes the PCI of the encoded second codebook and the RI of the second codebook, and the RI of the second codebook is expressed by 1bit for indicating that the rank of the precoding codebook is specifically 1 or 2, or if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {3 or 4}, the pattern of the feedback formats includes at least two second codebook information feedback formats, a first second codebook format and a second codebook format, wherein the first second codebook information feedback format is used for indicating the second codebook and PCI information when the rank of the precoding codebook is specifically 3 or 4, and the second codebook information feedback format is used for indicating the second codebook and PCI information when the rank of the codebook is specifically 1 or 2 PCI and RI information of the codebook.

If the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {1 or 2}, or if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {3 or 4}, and the feedback format on the corresponding TTI is the first second codebook feedback format, the product of the first codebook that can be determined by the first codebook information PCI and the second codebook corresponding to the second codebook information PCI is the finally used precoding codebook, the first codebook RI indicates the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information, and the second codebook RI in the range further indicates the specific precoding codebook rank in the feedback period of each second codebook information;

if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is in {3 or 4} and the feedback format corresponding to the TTI is the second codebook feedback format, the rank of the precoding codebook is the specifically indicated rank information in the second codebook feedback format, a column of column vectors is extracted from the first two columns of the first codebook and a column of two vectors is also extracted from the last two columns of the first codebook, the extracted two columns of column vectors form a new first codebook, and the new first codebook is multiplied by the precoding matrix corresponding to the PCI included in the second codebook information to be used as the final precoding matrix.

Fig. 9 is a schematic block diagram of a UE90 of a ninth embodiment of the present invention. The UE90 includes a receiving unit 91 and a transmitting unit 92.

The receiving unit 91 receives a feedback format pattern issued by the base station forwarding network side to the UE, and sends the feedback format pattern to the sending unit.

The sending unit 92 sends channel state information to the base station through the HS-DPCCH channel according to the feedback format pattern received by the receiving unit from the base station, where the channel state information includes first codebook information and second codebook information, the first codebook information includes a precoding codebook index value PCI of the first codebook and rank information RI of the first codebook, the second codebook information includes a PCI of the second codebook and an RI of the second codebook, the PCI of the first codebook and the PCI of the second codebook are used to determine a precoding codebook to be finally used for channel precoding, and the RI of the first codebook and the RI of the second codebook are used to determine a rank of the precoding codebook.

As prior art, the base station broadcasts the CPICH and sends the HS-PDSCH and HS-SCCH to the UE. And the UE performs channel estimation according to the received signal of the CPICH channel to obtain channel state information.

Optionally, as another embodiment, the pattern of the feedback formats used by the sending unit 92 includes two feedback formats corresponding to HS-DPCCH channels in one TTI unit, where a feedback format of first codebook information and a feedback format of second codebook information are respectively used to carry the first codebook information and the second codebook information, and in a pattern of one feedback format, the feedback format of the first codebook information is used at least in one specified TTI and the feedback format of the second codebook information is used at least in one or more specified consecutive TTI units, where a feedback period of the pattern of feedback formats corresponds to a feedback period of the first codebook information, and the feedback period of the first codebook information is longer than the feedback period of the second codebook information.

The pattern of the sending unit 92 using the feedback format may include the pattern of the feedback format in the third to sixth embodiments of the present invention, and specific details may refer to the first to eighth embodiments, and the specific details are omitted here for brevity.

Fig. 10 is a schematic block diagram of a base station 100 of a tenth embodiment of the present invention. Base station 100 includes a receiver 101, a processor 102, and a transmitter 103.

The transmitter 103 forwards the pattern of the feedback format sent to the UE by the network side.

The receiver 101 receives channel state information transmitted by the UE through the high speed dedicated physical control channel HS-DPCCH in accordance with the pattern of the feedback format transmitted by the transmitter 103 and transmits to the processor.

Processor 102 obtains a precoding codebook and a rank of the precoding codebook for performing precoding processing based on channel state information received by receiver 103, where the channel state information includes first codebook information and second codebook information, the first codebook information includes a precoding codebook index value PCI of the first codebook and rank information RI of the first codebook, the second codebook information includes a PCI of the second codebook and an RI of the second codebook, the PCI of the first codebook and the PCI of the second codebook are used for determining a precoding codebook to be finally used for channel precoding processing, and the RI of the first codebook and the RI of the second codebook are used for determining a rank of the precoding codebook.

Here, the first codebook (W)⁽¹⁾) Reflecting the channel relationship in co-polarized antennas is a long-term codebook, a second codebook (W)⁽²⁾) The relationship between the phase change and the channel change of different polarized antennas is shown, and the short-term codebook is formed. The precoding codebook finally used by the base station is jointly determined by the first codebook and the second codebook. Compared with the prior art using one codebook, the feedback information precision can be improved on the premise of the same feedback overhead by using the feedback information reflecting the channel quality of the double codebook. Wherein, the RI of the first codebook reflects whether the rank of the channel finally used is in the range of {1 or 2} or {3 or 4}, and the channel rank can be finally determined by combining the RI of the second codebook.

Further, the transmitter 103 transmits a pattern of the feedback format to the UE by forwarding RRC signaling. The feedback format pattern comprises two feedback formats corresponding to an HS-DPCCH channel in a TTI unit, wherein the feedback format of first codebook information and the feedback format of second codebook information are respectively used for bearing the first codebook information and the second codebook information, the feedback format of the first codebook information is used at least in one appointed TTI, and the feedback format of the second codebook information is used at least in one or more appointed continuous TTI units, wherein the feedback cycle of the feedback format pattern corresponds to the feedback cycle of the first codebook information, and the feedback cycle of the first codebook information is longer than the feedback cycle of the second codebook information.

The patterns of the feedback format received by the receiver 101 or sent by the transmitter 103 may refer to the patterns of the feedback format in the first to sixth embodiments, and for brevity, are not described herein again.

Fig. 11 is a schematic block diagram of a UE110 according to an eleventh embodiment of the present invention. UE110 includes a receiver 111, a processor 112, and a transmitter 113.

The receiver 111 receives a pattern of a feedback format issued by the base station forwarding network side to the UE, and sends the pattern to the processor 112.

As is known in the art, the receiver 111 also receives the CPICH broadcast by the base station, the HS-PDSCH and the HS-SCCH transmitted by the base station. The processor 112 performs channel estimation according to the CPICH channel received by the receiver 111 to obtain channel state information, and sends the channel state information to the transmitter 113.

The transmitter 113 transmits channel state information to the base station according to a feedback format pattern received by the receiver 111 from the base station through an HS-DPCCH channel, wherein the channel state information includes first codebook information of a long-term codebook and second codebook information of a short-term codebook, the first codebook information includes a precoding codebook index value (PCI) of the first codebook and Rank Information (RI) of the first codebook, the second codebook information includes a PCI of the second codebook and an RI of the second codebook, the PCI of the first codebook and the PCI of the second codebook are used for determining a precoding codebook to be finally used for channel precoding, and the RI of the first codebook and the RI of the second codebook are used for determining a rank of the precoding codebook.

The patterns of the feedback formats used by the transmitter 113 may refer to the patterns of the feedback formats in the first to sixth embodiments, and for brevity, are not described here again. The feedback format pattern comprises two feedback formats corresponding to an HS-DPCCH channel in a TTI unit, wherein the feedback format of first codebook information and the feedback format of second codebook information are respectively used for bearing the first codebook information and the second codebook information, the feedback format of the first codebook information is used at least in one appointed TTI, and the feedback format of the second codebook information is used at least in one or more appointed continuous TTI units, wherein the feedback cycle of the feedback format pattern corresponds to the feedback cycle of the first codebook information, and the feedback cycle of the first codebook information is longer than the feedback cycle of the second codebook information.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A feedback method for a high speed dedicated physical control channel (HS-DPCCH) is characterized by comprising the following steps:

the base station transmits a pattern of a feedback format issued to User Equipment (UE) by a network side;

the base station receives channel state information sent by the UE through a high-speed dedicated physical control channel (HS-DPCCH) according to the pattern of the feedback format to acquire a precoding codebook and the rank of the precoding codebook for executing precoding processing, wherein the base station receives the channel state information sent by the UE through the HS-DPCCH

The channel state information includes first codebook information and second codebook information, the first codebook information includes a precoding codebook index value PCI of the first codebook and rank information RI of the first codebook, the second codebook information includes a PCI of the second codebook and RI of the second codebook, the PCI of the first codebook and the PCI of the second codebook are used for determining a precoding codebook to be finally used for channel precoding, and the RI of the first codebook and the RI of the second codebook are used for determining a rank of the precoding codebook.

2. The method of claim 1, wherein the feedback format pattern comprises two feedback formats corresponding to HS-DPCCH channels within a TTI unit, a feedback format of first codebook information and a feedback format of second codebook information for carrying the first codebook information and the second codebook information, respectively,

in a pattern of feedback formats, using the feedback format of the first codebook information over at least one specified TTI, using the feedback format of the second codebook information over at least one specified consecutive TTI unit,

wherein a feedback period of the pattern of the feedback format corresponds to a feedback period of the first codebook information, the feedback period of the first codebook information being longer than a feedback period of the second codebook information.

3. The method of claim 2, wherein the feedback format of the first codebook information specifically comprises:

the feedback format of the first codebook information only includes the encoded PCI of the first codebook, and it can be determined that the rank of the precoding codebook indicated by the RI of the first codebook is within {1 or 2} or within {3 or 4} by the PCI of the first codebook.

4. The method according to claim 3, wherein the feedback format of the second codebook information specifically includes:

if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is {1 or 2}, the feedback format of the second codebook information only includes the PCI of the second codebook after encoding, the rank of the precoding codebook indicated by the RI of the second codebook is determined to be 1 or 2 specifically through the specific value of the TYPEA type CQI,

if the RI of the first codebook indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {3 or 4}, the second codebook information includes the PCI of the encoded second codebook and the RI of the second codebook, and the RI of the second codebook is expressed by 1bit for indicating whether the rank of the precoding codebook is specifically 3 or 4.

5. The method according to claim 3, wherein the feedback format of the second codebook information specifically includes:

if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is {1 or 2}, the second codebook information includes the PCI of the encoded second codebook and the RI of the second codebook, and the RI of the second codebook is expressed by 1bit for indicating that the rank of the precoding codebook is specifically 1 or 2,

if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is {3 or 4}, the second codebook information includes the PCI of the encoded second codebook and the RI of the second codebook, and the RI of the second codebook is expressed by 1bit for indicating whether the rank of the precoding codebook is specifically 3 or 4.

6. The method of claim 4 or 5, wherein the PCI of the first codebook and the PCI of the second codebook are used for determining a precoding codebook for channel precoding processing, and the method comprises the following steps:

and taking the product of a first codebook determined by the first codebook information PCI and a second codebook corresponding to the second codebook information PCI as a precoding codebook finally used in each TTI during downlink transmission, wherein the RI of the first codebook indicates the range of the rank of the precoding codebook in a feedback period corresponding to the first codebook information, and further indicates the specific rank of the precoding codebook in each feedback period of the second codebook information according to the RI of the first codebook and the RI of the second codebook.

7. The method according to claim 3, wherein the feedback format of the second codebook information specifically includes:

if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is {3 or 4}, the second codebook information includes the PCI of the encoded second codebook and the RI of the second codebook, and the RI of the second codebook is expressed by 2 bits and is used to indicate that the rank of the precoding codebook is specifically one of 1 to 4.

8. The method of claim 7, wherein the PCI of the first codebook and the PCI of the second codebook are used for determining a precoding codebook for final use of channel precoding processing, comprising:

if the first codebook RI indicates that the rank of the precoding codebook in the feedback period corresponding to the first codebook information is in the range of {1 or 2}, alternatively, if the first codebook RI indicates that the rank of the precoding codebook in the feedback period corresponding to the first codebook information is in the range of {3 or 4}, and the 2-bit second codebook RI indicates that the specific rank of the channel is still within 3 or 4, the product of the first codebook determined by the first codebook information PCI and the second codebook corresponding to the second codebook information PCI is the final used precoding codebook, the RI of the first codebook indicates a range of a rank of a precoding codebook within a feedback period corresponding to the first codebook information, according to the RI of the first codebook and the RI of the second codebook, the rank of a specific precoding codebook in a feedback period of each second codebook information is further indicated;

if the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is indicated by the first codebook RI is within {3 or 4} and the specific rank of the 2-bit second codebook RI indicated channel is within {1 or 2}, the rank of the precoding codebook is the rank information specifically indicated by the second codebook RI, a column of vectors are extracted from the first two columns of the first codebook and a column of vectors are also extracted from the last two columns of the first codebook, the extracted two columns of vectors form a new first codebook, and the new first codebook is multiplied by a precoding matrix corresponding to the PCI included in the second codebook information to be used as a final precoding matrix.

9. The method according to claim 3, wherein the feedback format of the second codebook information specifically includes:

if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is {3 or 4}, the pattern of the feedback format includes at least two second codebook information feedback formats, a first second codebook format and a second codebook format, where the first second codebook information feedback format is used to indicate the second codebook RI and PCI information when the rank of the precoding codebook is specifically 3 or 4, and the second codebook information feedback format is used to indicate the PCI and RI information of the second codebook when the rank of the precoding codebook is specifically 1 or 2.

10. The method of claim 9,

if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {1 or 2}, or if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is within {3 or 4}, and the feedback format on the corresponding TTI is the first second codebook feedback format, the product of the first codebook determined by the first codebook information PCI and the second codebook corresponding to the second codebook information PCI is the finally used precoding codebook, the first codebook RI indicates the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information, and the second codebook RI in the range further indicates the specific precoding codebook rank in each feedback period of the second codebook information;

if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is in {3 or 4} and the feedback format corresponding to the TTI is the second codebook feedback format, the rank of the precoding codebook is the specifically indicated rank information in the second codebook feedback format, a column vector is extracted from the first two columns of the first codebook and a column vector is also extracted from the last two columns of the first codebook, the extracted two columns of column vectors form a new first codebook, and the new first codebook is multiplied by a precoding matrix corresponding to the PCI included in the second codebook information to serve as a final precoding matrix.

11. A feedback method for a high speed dedicated physical control channel (HS-DPCCH) is characterized by comprising the following steps:

user Equipment (UE) receives a pattern of a feedback format issued to the UE by a base station forwarding network side;

the UE transmits channel state information to the base station through an HS-DPCCH channel according to the pattern of the feedback format received from the base station, wherein

12. The method of claim 11,

the feedback format pattern comprises two feedback formats corresponding to the HS-DPCCH channel in a TTI unit, a feedback format of first codebook information and a feedback format of second codebook information which are respectively used for bearing the first codebook information and the second codebook information,

13. The method of claim 12, wherein the feedback format of the first codebook information specifically comprises:

14. The method according to claim 13, wherein the feedback format of the second codebook information specifically includes:

15. The method according to claim 13, wherein the feedback format of the second codebook information specifically includes:

16. The method of claim 14 or 15, wherein the PCI of the first codebook and the PCI of the second codebook are used for determining a precoding codebook for channel precoding processing, and wherein the method comprises:

17. The method according to claim 13, wherein the feedback format of the second codebook information specifically includes:

18. The method of claim 17, wherein the PCI of the first codebook and the PCI of the second codebook are used for determining a precoding codebook for final use of channel precoding processing, comprising:

19. The method according to claim 11 or 12, wherein the feedback format of the second codebook information specifically comprises:

20. The method of claim 19,

if the first codebook RI indicates that the range of the rank of the precoding codebook in the feedback period corresponding to the first codebook information is {3 or 4} and the feedback format corresponding to the TTI is the second codebook feedback format, the rank of the precoding codebook is the specifically indicated rank information in the second codebook feedback format, a column of vectors is extracted from the first two columns of the first codebook and a column of vectors is also extracted from the last two columns of the first codebook, the extracted two columns of vectors form a new first codebook, and the new first codebook is multiplied by a precoding matrix corresponding to the PCI included in the second codebook information to serve as a final precoding matrix.

21. A base station, comprising a transmitting unit and a receiving unit:

the sending unit is used for forwarding a pattern of a feedback format issued by a network side to User Equipment (UE);

the receiving unit is used for receiving the channel state information sent by the UE according to the feedback format pattern sent by the sending unit through the high-speed dedicated physical control channel HS-DPCCH to acquire a precoding codebook and the rank of the precoding codebook for executing precoding processing, wherein the channel state information is sent by the UE according to the feedback format pattern sent by the sending unit

22. The base station of claim 21, wherein the pattern of the feedback formats used by the receiving unit comprises two feedback formats corresponding to HS-DPCCH channels in one TTI unit, a feedback format of first codebook information and a feedback format of second codebook information for carrying the first codebook information and the second codebook information, respectively,

23. A User Equipment (UE) comprises a receiving unit and a transmitting unit, and is characterized in that:

the receiving unit is used for receiving a feedback format pattern issued by a base station forwarding network side to the UE, and the feedback format pattern is sent to the sending unit;

the transmitting unit is configured to transmit channel state information to the base station through an HS-DPCCH according to the feedback format pattern received from the base station by the receiving unit, wherein

24. The UE of claim 23, wherein the feedback format pattern used by the sending unit includes two feedback formats corresponding to HS-DPCCH channels in a TTI unit, a feedback format of first codebook information and a feedback format of second codebook information for carrying the first codebook information and the second codebook information, respectively,