WO2011029386A1

WO2011029386A1 - Method for indicating relay link resource allocation, method and device for obtaining allocation information

Info

Publication number: WO2011029386A1
Application number: PCT/CN2010/076708
Authority: WO
Inventors: 李晏; 龚政委; 孙晓婷; 尚政
Original assignee: 华为技术有限公司
Priority date: 2009-09-10
Filing date: 2010-09-08
Publication date: 2011-03-17
Also published as: CN102026393A

Abstract

The present invention discloses a method for indicating relay link resource allocation, and a method and device for obtaining allocation information. The method for indicating resource allocation includes: determining the position of the initial Orthogonal Frequency Division Multiplex (OFDM) symbol of the Relay link Physical Downlink Shared Channel (R-PDSCH); informing every Relay Node (RN) of the position information of the initial OFDM symbol of said R-PDSCH; or informing every RN of the number of the OFDM symbols occupied by the Relay link Physical Downlink Control Channel (R-PDCCH) and the number of the OFDM symbols occupied by the Physical Downlink Control Channel (PDCCH) from the base station to the User Equipment (UE), in order that said every RN can determine the position of the initial OFDM symbol of said R-PDSCH. By the embodiments of the present invention, RNs can obtain the resource allocation information of the base station side, and thus receive the data in the R-PDSCH correctly.

Description

Resource allocation indication method of relay link, method and device for obtaining distribution information The application is submitted to the Chinese Patent Office on September 10, 2009, and the application number is 200910174724. 7. The invention name is "resource allocation indication of the relay link" The priority of the method, the method and the device for obtaining the information is disclosed in the Chinese Patent Application, the entire contents of which are incorporated herein by reference. Technical field

The present invention relates to the field of communications technologies, and in particular, to a resource allocation indication method for a relay link, and a method and device for obtaining allocation information. Background technique

With the rapid development of wireless communication services, a new generation of mobile communication systems must be able to support all Internet Protocol (IP) high-speed packet data transmission of more than 100 megabits per second (Mbps), and support high terminal mobility, transmission quality, Spectrum efficiency, etc. In terms of wide-area coverage, due to shadow fading and occlusion of buildings, the evolved Node B (eNB) in the traditional single-hop network cannot cover every place, and the coverage and capacity of the mobile communication system are improved by the relay technology. Wide-area continuous coverage, and thus, relay technology has received more and more attention. The relay technology is to set a relay node (RN) between the eNB and the user terminal, so that the RN transmits the signal sent by the eNB to a further user equipment (UE), and sends a signal sent by the farther UE to the UE. eNB. The eNB, the RN, and the UE form a relay network.

In a relay network, a link between an eNB and an RN is called a relay link or a backhaul link, and a link between the RN and the UE is called an access link, and a link between the eNB and the UE is called a link. Direct link. In the cell to which the RN is attached, the trunk is divided into an in-band relay and an out-of-band relay according to whether the link between the network side to the RN and the network side to the UE share the same frequency band resource.

In the in-band relay system, the resource allocation method of the downlink relay link is as shown in FIG. 1 , and different frequency band resources are allocated to different RNs, and within the frequency band resources of each RN, the relay link control channel and the medium are There are three ways to allocate resources along the link data channel: time division multiplexing (TDM), frequency division multiplexing (FDM), and TDM/FDM mixing.

In the prior art, the RN cannot know the allocation information of the resources allocated by the system in an effective manner. Summary of the invention

The embodiment of the invention provides a resource allocation indication method for a relay link, and a method and device for obtaining allocation information. An embodiment of the present invention provides a resource allocation indication method for a relay link, including:

Determining a starting orthogonal frequency division multiplexing OFDM symbol position of the relay link physical downlink shared channel R-PDSCH; And notifying the starting OFDM symbol position information of the R-PDSCH to each relay node; or, the number of OFDM symbols occupied by the relay link physical downlink control channel R-PDCCH and the physical downlink control channel PDCCH of the base station to the user equipment UE The number of OFDM symbols occupied is communicated to each relay node such that each of the relay nodes determines the starting OFDM symbol position of the R-PDSCH.

The embodiment of the invention further provides a method for obtaining shared channel resource allocation information, including:

Receiving the starting OFDM symbol position information of the R-PDSCH, or receiving the number of OFDM symbols occupied by the R-PDCCH and the number of OFDM symbols occupied by the PDCCH of the base station to the UE;

Obtaining, according to the starting OFDM symbol position information of the R-PDSCH, a starting OFDM symbol position of the R-PDSCH, or according to the OFDM symbol number occupied by the R-PDCCH and the OFDM occupied by the base station to the UE The number of symbols obtains the starting OFDM symbol position of the R-PDSCH.

The embodiment of the invention further provides a base station, including:

a determining module, configured to determine a starting OFDM symbol position of the R-PDSCH;

a sending module, configured to send the start OFDM symbol position information of the R-PDSCH to each relay node; or send the number of OFDM symbols occupied by the R-PDCCH and the number of OFDM symbols occupied by the PDCCH of the base station to the UE to each a relay node, such that each of the relay nodes determines a starting OFDM symbol position of the R-PDSCH.

The embodiment of the invention further provides a relay node device, including:

a receiving module, configured to receive initial OFDM symbol position information of the R-PDSCH, or receive the number of OFDM symbols occupied by the R-PDCCH and the number of OFDM symbols occupied by the PDCCH of the base station to the UE;

And a start symbol obtaining module, configured to learn, according to the starting OFDM symbol position information of the R-PDSCH, a starting OFDM symbol position of the R-PDSCH, or according to the OFDM symbol number occupied by the R-PDCCH and a base station to The number of OFDM symbols occupied by the PDCCH of the UE obtains the starting OFDM symbol position of the R-PDSCH.

In the above embodiment, the RN is informed of the number of OFDM symbols occupied by the R-PDCCH and the number of OFDM symbols occupied by the PDCCH of the base station to the UE, so that the RN can learn the resource allocation information of the eNB side, thereby correctly receiving the data in the R-PDSCH.

The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments. DRAWINGS

1 is a schematic diagram of resource allocation in the prior art;

2 is a flowchart of a resource allocation indication method for a relay link according to an embodiment of the present invention;

FIG. 3A is a downlink relay link control channel in a resource allocation indication method for a relay link according to an embodiment of the present invention; A centralized resource mapping diagram;

FIG. 3B is a schematic diagram of another centralized resource mapping of a downlink relay link control channel in a resource allocation indication method for a relay link according to an embodiment of the present invention; FIG.

3C is a schematic diagram of distributed resource mapping of a downlink relay link control channel in a resource allocation indication method of a relay link according to an embodiment of the present invention;

FIG. 4 is a flowchart of another resource allocation indication method for a relay link according to an embodiment of the present invention; FIG. 5 is a flowchart of a method for obtaining shared channel resource allocation information according to an embodiment of the present invention; A flowchart of a method for obtaining shared channel resource allocation information according to an embodiment of the present invention; FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a relay node apparatus according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of another relay node device according to an embodiment of the present invention. detailed description

FIG. 2 is a flowchart of a resource allocation indication method for a relay link according to an embodiment of the present invention. In this embodiment, it is assumed that the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols occupied by the control channel transmitted by the UE in the relay subframe to the respective coverage is not performed in advance by the eNB and the RN. The method includes: Step 21: Determine a starting OFDM symbol position of a Relay Link Physical Downlink Shared Channel (R-PDSCH);

The R-PDSCH can be determined according to the number of OFDM symbols occupied by the Physical Downlink Control Channel (PDCCH) and the Relay Link Physical Downl Control Channel (R-PDCCH). An initial OFDM symbol; the starting OFDM symbol of the R-PDSCH is located before or after the OFDM symbol occupied by the R-PDCCH; the initial OFDM symbol of the R-PDCCH is fixed;

Step 22: Informing each RN of the starting OFDM symbol position information of the R-PDSCH; or, informing the RNs of the number of OFDM symbols occupied by the R-PDCCH and the number of OFDM symbols occupied by the PDCCH of the base station to the UE, so that the Each RN determines the starting OFDM symbol position of the R-PDSCH.

The starting OFDM symbol position information of the R-PDSCH includes a deviation value of the R-PDSCH from a starting OFDM symbol of the R-PDCCH, or the information includes a starting OFDM symbol of the R-PDSCH. The absolute value. The R-PDCCH is a control channel of the eNB to the RN, and the PDCCH is a control channel of the eNB to the UE, or a control channel of the RN to the UE.

The above steps 21 and 22 can be performed by a base station such as an eNB. In the foregoing step 21, the start position of the R-PDCCH is fixed after the symbol occupied by the PDCCH, in order to avoid the transmission and reception switching to the relay link physical control format indicator channel (R_PCFICH), The downlink relay link control channel, such as the relay link physical hybrid-ARQ indicator channel (R_PHICH) and the R-PDCCH, affects the downlink relay link control channel, and downlinks the R_PCFICH, R-PHICH, and R-PDCCH. The link control channel is sent as far as possible on the symbol resource after the RN completes the transceiving conversion. The symbol resource after the RN completes transceiving and transforming does not include symbol resources for transceiving and translating. On one hand, since the number of PDCCH symbols transmitted by the RN to the UE does not exceed two in the subframe of the relay link, and the time for completing the transceiving conversion does not exceed one OFDM symbol, the control channel start symbol of the RN may be placed. On the third symbol resource. On the other hand, since the downlink relay link control channel must be placed on the symbol resource after the PDCCH of the direct link, and the number of PDCCHs of the direct link varies with the system bandwidth, it can occupy up to 3 and 4 symbol resources respectively. Considering the foregoing two factors comprehensively, and without increasing the system overhead between the eNB and the RN, the starting symbol of the downlink relay link control channel may be fixed in the following two cases: When N^≤10, R - _PCFICH , R-PHICH, R-PDCCH are mapped from OFDM symbols of Z = 4, that is, OFDM symbols starting from = ⁴ are allocated to R-PCFICH, R_PHICH, R-PDCCH; when ^^ ^{> 1 Q} , R- The PCFICH, the R-PHICH, and the R-PDCCH are mapped from the OFDM symbol of Z=3, that is, the OFDM symbols starting from = ³ are allocated to the R-PCFICH, the R_PHICH, and the R_PDCCH.

Since the number of symbol resources occupied by the control channel of the direct link changes according to different system bandwidths and traffic volume, the number of OFDM symbols occupied by the direct link is dynamically changed between 1 to 3 or 2 to 4, and the downlink relay link The starting position of the control channel has been fixed. Therefore, in order to optimize the resources of the downlink relay link, the R-PDSCH may be required by the eNB according to various control channels including the relay link and the direct link in the relay subframe. The number of OFDM symbols occupied, dynamically determined

The starting symbol of R-PDSCH effectively improves resource utilization. The eNB determines the start symbol position of the R-PDSCH resource mapping according to the OFDM symbol number PDCCH occupied by the control channel PDCCH of the UE covered by the eNB, and according to the number of OFDM symbols ^N R- H occupied by the control channel R-PDCCH to the RN. . Specifically, the eNB removes the OFDM symbol position occupied by the PDCCH transmitted to the lower UE and the R-PDCCH transmitted to the RN, and allocates the OFDM symbol that the RN considers to be the earliest to start receiving to the R-PDSCH, that is, allocates resources for the R-PDSCH. .

The results of resource allocation after the above step 21 are as shown in Figs. 3A, 3B, and 3C. 3A is a schematic diagram of centralized resource mapping of a downlink relay link control channel in a resource allocation indication method of a relay link according to an embodiment of the present invention. In Figure 3A, all R-PDSCHs are within the range of the relay control channel band. Figure 3B is a Another centralized resource mapping diagram of the downlink relay link control channel in the resource allocation indication method of the relay link provided by the embodiment. In Figure 3B, some R-PDSCHs are outside the range of the relay control channel band. FIG. 3C is a schematic diagram of distributed resource mapping of a downlink relay link control channel in a resource allocation indication method of a relay link according to an embodiment of the present invention. In FIG. 3A, FIG. 3B and FIG. 3C, 31 is the PCFICH, PHICH, and PDCCH from the eNB to the UE, 32 is the PCFICH, PHICH, and PDCCH from the RN to the UE, 33 is the PDSCH from the eNB to the UE, and 34 is from the RN to The PDSCH of the UE, 35 is the R-PCFICH, R-PHICH, and R-PDCCH from the eNB to the RN, and 36 is that the RN receives the R_PCFICH, the R-PHICH, the R_PDCCH, and the R-PDSCH from the eNB, and 37 is the R- from the eNB to the RN. PDSCH, 38 is the conversion band sent to the receiver.

As shown in FIG. 3A, FIG. 3B and FIG. 3C, the subframe N is a relay subframe. In the relay subframe, the eNB can semi-statically configure a frequency band of BW _R for transmitting downlinks such as R-PCFICH, R-PHICH, and R-PDCCH by considering the channel conditions and traffic of each RN relay link. Relay link control channel. The band resource having the width BW _R may be a centralized type as shown in FIG. 3A and FIG. 3B, or may be distributed as shown in FIG. 3C. And, in order to avoid the impact of the transmission and reception on the downlink relay link control channel, the starting symbols of the R_PCFICH, the R-PHICH, and the R-PDCCH are fixed, that is, when

^ From the time the sub-frame ≤1G / = _0FDM start symbol mapping 4; when ^{^^>} sub-frame from the time ^{1 Q} / = _0FDM 3 symbols beginning mapping.

If the frequency resource occupied by the R-PDSCH is as shown in FIG. 3A, in the frequency resource range occupied by the downlink relay link control channel, the R-PDSCH resource mapping start symbol set in the same frequency band as the relay control channel is set. As shown in Table 1.

Table 1

At this time, the eNB allocates the same initial OFDM symbols for the R-PDSCH of all RNs.

If the frequency resource occupied by the R-PDSCH of the RN is as shown in FIG. 3B and FIG. 3C, the frequency resource occupied by the R-PDSCH is in the downlink relay chain outside the frequency resource range occupied by the downlink relay link control channel. The R-PDSCH resource mapping start symbol setting of the RN outside the frequency resource range occupied by the path control channel is as shown in Table 2. Table 2

In the foregoing step 22, the RN cannot receive the PCFICH of the eNB to the UE, that is, the RN cannot learn the eNB to the UE.

^A number of OFDM symbols occupied by the PDCCH, the eNB need some mechanism message indicating R-PDSCH OFDM symbols to start the RN, for example: by a group R-PCFICH source information will be occupied by the R-PDCCH OFDM The number of symbols is sent to each RN; another set of source information of the two sets of source information is used to start OFDM symbol position information of the R-PDSCH or OFDM symbols occupied by the PDCCH of the base station to the UE Sent to the RNs. Or, by using the number of OFDM symbols occupied by the R-PDCCH and the starting OFDM symbol position information of the R-PDSCH, or the number of OFDM symbols occupied by the R-PDCCH and the OFDM occupied by the PDCCH of the base station to the UE The symbol number joint coding is transmitted to the RNs in a set of source information of the R-PCFICH. Or, by adding a DCI format in the R-PDCCH or by adding a bit number in the DCI format, sending the starting OFDM symbol position information of the R-PDSCH or the OFDM symbol number occupied by the PDCCH of the base station to the UE to the Each RN or the higher layer signaling indicates the number of OFDM symbols occupied by the R-PDCCH.

When the initial OFDM symbol position information of the R-PDSCH transmitted by the eNB is a deviation value of the R-PDSCH from the start symbol position of the R-PDCCH, the resource allocation method of the relay link provided by the embodiment of the present invention may further include : transmitting the number of OFDM symbols occupied by the R-PDCCH to the RNs. In this way, each RN can calculate the starting OFDM symbol of the R-PDSCH based on the offset value and the number of OFDM symbols occupied by the R-PDCCH.

In this case, the source information of the 4-bit (bit) R-PCFICH may be divided into two groups, each group including 2 bits of relay link control format indication (R-CFI) source information, which are respectively used to indicate the R-PDCCH station. The number of symbols and the R-PDSCH starting OFDM symbol, SP, and the number of OFDM symbols occupied by the R-PDCCH and the R-PDSCH starting OFDM symbol position information are transmitted to the RNs. The R-PDSCH starting OFDM symbol position information is a deviation value of the R-PDSCH from the starting OFDM symbol of the R-PDCCH, and is used to indicate a set of R-CFI source information and R- of the R-PDSCH starting OFDM symbol. PDSCH starting OFDM The correspondence between the deviation values of the symbols is shown in Table 3.

table 3

Each group of source information is encoded using the existing PCFICH (32, 2) encoding. Each group of source information is encoded and modulated to obtain 16 symbols, which constitutes 8 R-PCFICH quaternions (a group of 4 symbols), which can be mapped to 8 resource element groups (Resource Element Group, REG). . The mapping method of the eight REGs is: Sorting the subcarriers occupied by all the relay control channels from the low frequency to the top, that is, ^^ '^^'...'^ ⁷ ^, and then calculating each REG according to the following formula Mapping the starting position, thereby finding the corresponding relay subcarrier ^{β to} start mapping:

7 ⁽ is mapped to the resource - element group represented by k =i

7 ⁽ is mapped to the resource - element group represented by k =i+ k /2j-N _s / '2

7 ⁽ ^P) (2) is mapped to the resource - element group represented by k =k+ [2N /2". /2

7 ^{( rf} (3) is mapped to the resource - element group represented by k =k+ [3N _R /2".N /2

^{7 (rf (4) is mapped} to the resource - element group represented by k

7 ^{( rf} (5) is mapped to the resource - element group represented by k =k+ LN _R /2j-N _s / '2 + N

7 ^{( rf} (6) is mapped to the resource - element group represented by k =k+ [2N /2". /2 + N

7 ^{( ρ)} ω is mapped to the resource - element group represented by k = k + [3N _R /2". N /2 + N .

N ^R

Wherein, Ί, N represents the channel bandwidth of the downstream relay ^link, 7Vsc represents the number of subcarriers in each RB, _¾, K. = _s , when

When there is no CRS on the symbol, K0=3; when there is CRS on the symbol, Κ0=2.

The method provided in this embodiment fixes the initial OFDM symbol of the R-PDCCH, so that the R-PDCCH is not affected by the transmission and reception conversion, and can obtain the frequency diversity gain in a large frequency band, thereby ensuring the relay link control information. Correctly connected In the case that the number of OFDM symbols occupied by the PDCCH of the eNB to the UE is small, the R-PDSCH is placed before the R-PDCCH, and the time-frequency resources of the relay link are fully utilized. Moreover, when the eNB side allocates resources, it is not necessary to know the number of OFDM symbols occupied by the PDCCH of the RN to the UE, which saves a certain signaling overhead and avoids early scheduling. Further, by transmitting the starting OFDM symbol position information of the R-PDSCH or the number of OFDM symbols occupied by the PDCCH of the base station to the UE, the RN can learn the resource allocation information of the eNB side, thereby correctly receiving the data in the R-PDSCH.

FIG. 4 is a flowchart of another method for resource allocation indication of a relay link according to an embodiment of the present invention. In this embodiment, each RN may notify the eNB of the number of OFDM symbols occupied by the PDCCH transmitted to the UE in advance. The method includes: Step 41: Each RN informs an eNB of the number of OFDM symbols occupied by the PDCCH that is sent to the UE in advance, and the eNB learns the number of OFDM symbols occupied by the PDCCH of each RN to the UE;

Step 42: The eNB determines the start of the R-pDSCH resource mapping according to three factors: OFDM symbol number 丄, 、, PDccH ^V fi-TMccff, which are occupied by the eNB to the UE, the RN to the UE, and the control channel of the eNB to the RN. OFDM symbol.

The eNB semi-statically configures a frequency band of BW _R for transmitting a downlink relay link control channel such as R-PCFICH, R_PHICH, and R-PDCCH. The band width is BW _R resources may FIG. 3A, FIG 3B, the centralized type, may be distributed as shown in FIG. 3C. Moreover, in order to avoid the influence of the transceiving on the downlink relay link control channel, the starting symbols of the R-PCFICH, the R-PHICH, and the R-PDCCH are fixed, that is, when ^{≤ 1 (3} , from the sub-frame ^Z = ⁴⁾ The OFDM symbol starts to map; when ^ ^{> 1 ()} , the mapping starts from the OFDM symbol of ^{/ = 3} in the subframe. For details, refer to the description of step 21 above.

The eNB removes the number of OFDM symbols occupied by the PDCCH that is sent by the PDCCH and the R-PDCCH that it sends to the RN, and the number of OFDM symbols occupied by the PDCCH that each RN sends to its lower UE, which can be the earliest from each RN. The OFDM symbols that can start to receive start to place the R_PDSCH of each RN. At this time, the R-PDSCH start symbols of the respective RNs may be different.

If the frequency resource occupied by the R-PDSCH is as shown in FIG. 3A, in the frequency resource range occupied by the downlink relay link control channel, the R-PDSCH resource mapping start in the same frequency band as the downlink relay link control channel The settings of the symbols are shown in Table 4.

Table 4

twenty two

2 1 or 2 2 2

3 1 or 2 3 3 ⁺ N _R — _PDCCH

4 1 or 2 4 ^Ί + ^l N R-PDCCH If the frequency resource occupied by the R-PDSCH of some RNs is as shown in FIG. 3C, outside the frequency resource range occupied by the downlink relay link control channel, these RNs The R-PDSCH resource mapping starting OFDM symbol setting of the outbound relay link control channel outband is as shown in Table 5:

table 5

Step 43: If the eNB does not notify the RN of the OFDM symbol number ^v _{TMc OT} of the PDCCH transmitted by the eNB to the UE, the eNB indicates the R-PDSCH to the RN by using a certain message mechanism in the relay control channel. The starting OFDM symbol. For the manner in which the eNB indicates the starting OFDM symbol of the R-PDSCH, refer to the R-PCFICH indication mechanism in the above embodiment. In this embodiment, the R-CFI source information of the R-PCFICH is used to indicate the absolute value of the starting OFDM symbol of the R-PDSCH. The correspondence between the R-CFI source information and the initial OFDM symbol of the R-PDSCH is as shown in Table 6.

Table 6 R-CFI

R-PDSCH start symbol: I ≤10 > 10

1 2 1

2

twenty three

3 4 4+ "NR- PDCCH 3 or 3+ N _fl — _pra

4 ― one

If the eNB informs the RN in advance

, the OFDM symbol of the RN R-PDSCH is not required to be notified, and the RN passes the jeNB → UE f eNB → UE

H can calculate the starting OFDM symbol of the R-PDSCH. The starting OFDM symbol of the R-PDSCH is obtained by the above Table 1 or Table 2 according to the known H.

The method provided in this embodiment allocates OFDM symbols to the R-PDSCH of each RN by using the number of OFDM symbols occupied by the PDCCHs of the RNs to the UEs, and improves the accuracy of R-PDSCH resource allocation while avoiding the influence of the transmission and reception conversion. .

FIG. 5 is a flowchart of a method for obtaining shared channel resource allocation information according to an embodiment of the present invention. This embodiment corresponds to the foregoing method embodiment, and specifically includes:

Step 51: Receive initial OFDM symbol position information of the R-PDSCH, where the starting OFDM symbol position of the R-PDSCH is determined according to the number of OFDM symbols occupied by the PDCCH of the eNB to the UE and the number of OFDM symbols occupied by the R-PDCCH; The starting OFDM symbol of the R-PDSCH is located before or after the OFDM symbol occupied by the R-PDCCH; the starting OFDM symbol of the R-PDCCH is fixed;

Step 52: Receive the R_PDSCH according to the starting OFDM symbol position information of the R-PDSCH.

The above steps 51 and 52 can be performed by the RN.

In the foregoing step 51, the RN receives the starting OFDM symbol position information of the R-PDSCH, such as the offset value of the R-PDSCH relative to the starting OFDM symbol of the R-PDCCH, or the starting OFDM symbol of the R-PDSCH. Absolute value.

In the above step 52, the RN obtains the starting OFDM symbol position of the R-PDSCH according to the starting OFDM symbol position information of the received R-PDSCH. When the information received by the RN in the above step 51 is the deviation value of the R-PDSCH from the initial OFDM symbol of the R-PDCCH, as shown in Table 3 above, the RN may obtain the deviation value indicated by the R-CFI according to Table 3. And obtaining an initial OFDM symbol of the R-PDSCH according to the offset value and the number of OFDM symbols occupied by the R-PDCCH. When the above step 51 When the information received by the RN is the absolute value of the starting OFDM symbol of the R-PDSCH, as shown in Table 6 above, the starting OFDM symbol of the R-PDSCH can be obtained from Table 6 directly according to the received information R-CFI, and The R-PDSCH is received from the resulting starting OFDM symbol.

In the method provided in this embodiment, the RN can receive the R-PDSCH accurately by receiving the initial OFDM symbol position information of the R-PDSCH, and the R-PDCCH is fixed according to the initial OFDM symbol allocated by the R-PDSCH. Obtained, so that the RN receives the R-PDSCH from the transmission and reception conversion, and ensures the correct reception of the data information.

FIG. 6 is a flowchart of another method for obtaining shared channel resource allocation information according to an embodiment of the present invention. The embodiment corresponds to the foregoing embodiment of the resource allocation method of the relay link, and specifically includes:

Step 61: Receive, by the base station, the number of OFDM symbols occupied by the PDCCH of the eNB to the UE;

Step 62: Calculate the start of the R-PDSCH according to the number of OFDM symbols occupied by the PDCCH of the base station to the UE.

OFDM symbol; the starting OFDM symbol of the R-PDSCH is determined according to the number of OFDM symbols occupied by the eNB to the PDCCH of the UE and the number of OFDM symbols occupied by the R-PDCCH; the starting OFDM symbol of the R-PDSCH is located in the Before or after the OFDM symbol occupied by the R-PDCCH; the starting OFDM symbol of the R-PDCCH is fixed; for details, refer to the description of the above step 21 and FIG. 3A, FIG. 3B, and FIG. 3C.

Step 63: Receive the R_PDSCH according to a starting OFDM symbol of the R-PDSCH.

The above steps 61, 62, and 63 can be performed by the RN.

In the foregoing step 61, the RN receives the number of OFDM symbols occupied by the PDCCH transmitted by the eNB to the UE, so that the RN can calculate the starting OFDM symbol of the R-PDSCH according to the number of OFDM symbols occupied by the PDCCH of the eNB to the UE.

In the foregoing step 62, the RN calculates the starting OFDM symbol of the R-PDSCH according to the received OFDM symbol number occupied by the eNB to the UE. For example, when the frequency resource occupied by the R-PDSCH is within the frequency resource occupied by the downlink relay link control channel, as shown in Table 1 and Table 4 above, the PDCCH according to the eNB to the UE in different system bandwidth conditions. The number of OFDM symbols occupied, or the starting OFDM symbol of the corresponding R-PDSCH according to the number of OFDM symbols occupied by the eNB to the UE and the PDCCH of the RN to the UE. When the frequency resource occupied by the R-PDSCH is outside the frequency resource range occupied by the downlink relay link control channel, refer to Table 2 and Table 5 above. According to the different system bandwidth, the PDCCH is occupied by the eNB to the UE. The number of OFDM symbols, or the starting OFDM symbol of the corresponding R-PDSCH according to the number of OFDM symbols occupied by the eNB to the UE and the PDCCH of the RN to the UE.

In the above step 63, the RN receives the R_PDSCH from the initial OFDM symbol of the R-PDSCH calculated in the above step 62. In the method provided in this embodiment, the RN calculates the starting OFDM symbol of the R-PDSCH according to the number of OFDM symbols occupied by the eNB to the UE transmitted by the eNB, and the starting OFDM symbol allocated by the R-PDSCH is based on the starting OFDM. The symbol-fixed R-PDCCH is obtained, so that the RN receives the R-PDSCH from the calculated initial OFDM symbol. The conversion effect is affected, and the correct reception of the data information is guaranteed.

FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention. The base station can be an eNB, including a determining module 71 and a transmitting module 72. The determining module 71 is configured to determine a starting OFDM symbol position of the R-PDSCH according to the number of OFDM symbols occupied by the PDCCH and the R-PDCCH; the starting OFDM symbol of the R-PDSCH is located before the OFDM symbol occupied by the R-PDCCH or Thereafter; the starting OFDM symbol of the R-PDCCH is fixed. The sending module 72 is configured to send the start OFDM symbol position information of the R-PDSCH to each RN, or send the number of OFDM symbols occupied by the R-PDCCH and the number of OFDM symbols occupied by the PDCCH of the base station to the UE to each RN. The RN determines the starting OFDM symbol position of the R-PDSCH. The information includes a deviation value of the R-PDSCH from a starting OFDM symbol of the R-PDCCH, or the information includes an absolute value of a starting OFDM symbol of the R-PDSCH. The determining module 71 is specifically configured to determine a starting OFDM symbol position of the R-PDSCH according to the number of OFDM symbols occupied by the PDCCH of the base station to the UE and the number of OFDM symbols occupied by the R-PDCCH.

In this embodiment, the base station fixes the initial OFDM symbol of the R-PDCCH, so that the R-PDCCH is not affected by the transmission and reception conversion, and can obtain the frequency diversity gain in a large frequency band, thereby ensuring the relay link control information. Correctly received, when the number of OFDM symbols occupied by the PDCCH of the base station to the UE is small, the R-PDSCH is placed before the R-PDCCH, and the time-frequency resources of the relay link are fully utilized. Moreover, when the base station side allocates resources, it is not necessary to know the number of OFDM symbols occupied by the PDCCH of the RN to the UE, which saves a certain signaling overhead and avoids early scheduling. Further, by transmitting the initial OFDM symbol position information of the R-PDSCH or the number of OFDM symbols occupied by the PDCCH of the base station to the UE, the RN can learn the resource allocation information of the base station side, thereby correctly receiving the data in the R-PDSCH.

The base station provided by the embodiment of the present invention may further include an obtaining module 73. The obtaining module 73 is configured to learn the number of OFDM symbols occupied by the PDCCHs of the RNs to the UE. At this time, the determining module 71 further determines, according to the number of OFDM symbols occupied by the PDCCH of each RN to the UE, the starting OFDM symbol of the R-PDSCH of each RN, that is, according to the PDCCH occupied by the base station to the UE. The number of OFDM symbols and the number of OFDM symbols occupied by the R-PDCCH, and the starting OFDM symbol position of the R-PDSCH of each of the relay nodes are determined according to the number of OFDM symbols occupied by the PDCCHs of the respective relay nodes to the UE.

The sending module 72 is further configured to send the number of OFDM symbols occupied by the R-PDCCH to the RNs, so that

When the information indicated in the R-CFI is the deviation value of the R-PDSCH from the initial OFDM symbol of the R-PDCCH, the RN can calculate the starting OFDM symbol of the R-PDSCH according to the offset value and the number of OFDM symbols occupied by the R-PDCCH. . Or, when the starting OFDM symbol of the R-PDSCH is located after the R-PDCCH, the RN calculates the starting OFDM symbol of the R-PDSCH according to the number of OFDM symbols occupied by the R-PDCCH and the number of OFDM symbols occupied by the PDCCH of the base station to the UE. .

The sending module 72 may be specifically configured to occupy the R-PDCCH by using a set of R-CFI source information of the R-PCFICH. The number of OFDM symbols is sent to each of the relay nodes; another set of source information of the two sets of source information is used to start OFDM symbol position information of the R-PDSCH or PDCCH occupancy of the base station to the UE The number of OFDM symbols is sent to each of the RNs. For details, see the description of step 22 above.

Or the sending module 72 may be specifically configured to use, by using a set of jointly encoded source information of the R-PCFICH, the number of OFDM symbols occupied by the R-PDCCH and the starting OFDM symbol position information of the R-PDSCH, or The number of OFDM symbols occupied by the R-PDCCH and the number of OFDM symbols occupied by the PDCCH of the base station to the UE are sent to the RNs. See the description of step 22 above for details.

Or the sending module 72 may be specifically configured to: start the OFDM symbol position information of the R-PDSCH or the base station to the UE by adding a DCI format in the R-PDCCH or by adding a bit number in the DCI format. The number of OFDM symbols occupied by the PDCCH is sent to each of the relay nodes, or the number of OFDM symbols occupied by the R-PDCCH is transmitted to the RNs by higher layer signaling.

FIG. 8 is a schematic structural diagram of a relay node apparatus according to an embodiment of the present invention. The RN device includes: a receiving module 81 and a start symbol learning module 82. The receiving module 81 is configured to receive initial OFDM symbol position information of the R-PDSCH, such as receiving R_CFI, DCI, and the like; the starting OFDM symbol of the R-PDSCH is occupied according to the OFDM symbol occupied by the PDCCH of the eNB to the UE, and the R-PDCCH is occupied. The number of OFDM symbols is determined; the starting OFDM symbol of the R-PDSCH is located before or after the OFDM symbol occupied by the R-PDCCH; and the starting OFDM symbol of the R-PDCCH is fixed. The start symbol learning module 82 is configured to learn the starting OFDM symbol position of the R-PDSCH according to the starting OFDM symbol position information of the R-PDSCH, or according to the OFDM symbol number occupied by the R-PDCCH and the base station to The number of OFDM symbols occupied by the PDCCH of the UE obtains the starting OFDM symbol position of the R-PDSCH.

The receiving module 81 may be specifically configured to receive, by using one set of source information of the two sets of source information of the R-PCFICH, the number of OFDM symbols occupied by the R-PDCCH; and adopt another set of the two sets of source information. The source information receives the starting OFDM symbol position information of the R-PDSCH or the number of OFDM symbols occupied by the PDCCH of the base station to the UE;

Or, specifically, used to receive, by using a set of jointly encoded source information of the R-PCFICH, the number of OFDM symbols occupied by the R-PDCCH and the starting OFDM symbol position information of the R-PDSCH, or the R-PDCCH occupied by the R-PDCCH The number of OFDM symbols and the number of OFDM symbols occupied by the PDCCH of the base station to the UE;

Or, by using the DCI format added in the R-PDCCH or by increasing the number of bits in the DCI format, receiving the start OFDM symbol position information of the R-PDSCH or the number of OFDM symbols occupied by the PDCCH of the base station to the UE, or The number of OFDM symbols occupied by the high layer signaling or the R-PDCCH is received.

In this embodiment, the RN can receive the R-PDSCH accurately by receiving the initial OFDM symbol position information of the R-PDSCH, and the initial OFDM symbol allocated by the R-PDSCH is obtained according to the fixed R-PDCCH of the initial 0FDM symbol, thereby obtaining Make The RN receives the R-PDSCH from the transmission and reception conversion, and ensures the correct reception of the data information.

FIG. 9 is a schematic structural diagram of another relay node device according to an embodiment of the present invention. The RN device includes: an OFDM symbol number receiving module 91, a calculating module 92, and an R-PDSCH receiving module 93. The OFDM symbol number receiving module 91 is configured to receive the number of OFDM symbols occupied by the PDCCH of the eNB to the UE. The calculating module 92 is configured to calculate, according to the OFDM symbol number occupied by the PDCCH, a starting OFDM symbol of the R-PDSCH, and the starting OFDM symbol of the R-PDSCH according to the OFDM symbol number occupied by the eNB to the UE and the R Determining the number of OFDM symbols occupied by the PDCCH; the starting OFDM symbol of the R-PDSCH is located before or after the OFDM symbol occupied by the R-PDCCH; and the starting OFDM symbol of the R-PDCCH is fixed. The R-PDSCH receiving module 93 is configured to receive the R_PDSCH according to a starting OFDM symbol of the R-PDSCH.

In this embodiment, the RN calculates the starting OFDM symbol of the R-PDSCH according to the number of OFDM symbols occupied by the PDCCH transmitted by the eNB to the UE, and the starting OFDM symbol allocated by the R-PDSCH is fixed according to the starting OFDM symbol. The R-PDCCH is obtained, so that the RN receives the R-PDSCH from the calculated initial OFDM symbol without being affected by the transceiving conversion, and ensures correct reception of the data information.

In the foregoing embodiment, the starting positions of the downlink relay link control channels R_PCFICH, R-PHICH, and R-PDCCH are fixed, which avoids the downlink relay link control channel from being affected by the transmission and reception conversion, and can be obtained in a larger frequency band. The frequency diversity gain ensures correct reception of relay link control information. Further, when the PDCCH of the eNB to the UE occupies a small number of OFDM symbols, the R-PDSCH is placed before the R-PDCCH, and the time-frequency resources of the relay link are fully utilized. In addition, when the eNB side resources are mapped, it is not necessary to know the number of OFDM symbols occupied by the PDCCH of the RN to the UE, which saves a certain signaling overhead and avoids early scheduling.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The steps of the foregoing method embodiments are included; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced; and the modifications or substitutions do not deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request

A resource allocation indication method for a relay link, comprising:

Determining a starting Orthogonal Frequency Division Multiplexing OFDM symbol position of the relay link physical downlink shared channel R-PDSCH; informing the relay node of the starting OFDM symbol position information of the R-PDSCH; or The number of OFDM symbols occupied by the R-PDCCH of the physical downlink control channel and the number of OFDM symbols occupied by the physical downlink control channel PDCCH of the base station to the user equipment UE are notified to the relay nodes, so that the relay nodes determine the R-PDSCH. The starting OFDM symbol position.

The resource allocation indication method of the relay link according to claim 1, wherein the starting OFDM symbol position information of the R-PDSCH includes the starting OFDM of the R-PDSCH with respect to the R-PDCCH The offset value of the symbol, or the information includes the absolute value of the starting OFDM symbol of the R-PDSCH.

The resource allocation indication method of the relay link according to claim 1, wherein determining the initial OFDM symbol position of the R-PDSCH includes:

The starting OFDM symbol position of the R-PDSCH is determined according to the number of OFDM symbols occupied by the PDCCH of the base station to the UE and the number of OFDM symbols occupied by the R-PDCCH.

The resource allocation indication method of the relay link according to claim 3, further comprising: learning the number of OFDM symbols occupied by the PDCCHs of the relay nodes to the UE;

Determining the starting OFDM symbol position of the R-PDSCH, including: the number of OFDM symbols occupied by the PDCCH according to the base station to the UE, the number of OFDM symbols occupied by the R-PDCCH, and the PDCCH occupation according to the PDCCH of each relay node to the UE The number of OFDM symbols determines the starting OFDM symbol position of the R-PDSCH of each of the relay nodes.

The resource allocation indication method of the relay link according to any one of claims 1 to 4, wherein the initial OFDM symbol position information of the R-PDSCH is notified to each relay node, or Sending the number of OFDM symbols occupied by the R-PDCCH and the number of OFDM symbols occupied by the PDCCH of the base station to the UE to each relay node, including:

Transmitting, by the set of source information of the two sets of source information of the R-PCFICH, the number of OFDM symbols occupied by the R-PDCCH to the relay nodes; another set of source information of the two sets of source information is used for Transmitting the starting OFDM symbol position information of the R-PDSCH or the OFDM symbol number occupied by the PDCCH of the base station to the UE to the each relay node; or, by using the number of OFDM symbols occupied by the R-PDCCH The initial OFDM symbol position information of the R-PDSCH, or the number of OFDM symbols occupied by the R-PDCCH and the number of OFDM symbols occupied by the PDCCH of the base station to the UE are jointly encoded and sent in a set of source information of the R-PCFICH. Giving the relay nodes; or

The R-PDSCH is added by adding a DCI format in the R-PDCCH or by adding a bit number in the DCI format. The starting OFDM symbol position information or the number of OFDM symbols occupied by the PDCCH of the base station to the UE is sent to the relay nodes, or the number of OFDM symbols occupied by the R-PDCCH is indicated by higher layer signaling.

6. A method for learning shared channel resource allocation information, comprising:

The method for obtaining shared channel resource allocation information according to claim 6, wherein: receiving initial OFDM symbol position information of the R-PDSCH, or receiving the number of OFDM symbols occupied by the R-PDCCH and the base station to the UE The number of OFDM symbols occupied by the PDCCH, including:

Receiving, by a set of source information of two sets of source information of the R-PCFICH, the number of OFDM symbols occupied by the R-PDCCH; receiving, by another set of source information of the two sets of source information, a start of the R-PDSCH OFDM symbol position information or the number of OFDM symbols occupied by the PDCCH of the base station to the UE;

Or, the number of OFDM symbols occupied by the R-PDCCH and the starting OFDM symbol position information of the R-PDSCH, or the number of OFDM symbols occupied by the R-PDCCH, are obtained by using a set of jointly encoded source information of the R-PCFICH. And the number of OFDM symbols occupied by the PDCCH of the base station to the UE;

Or, by using the DCI format added in the R-PDCCH or by increasing the number of bits in the DCI format,

The starting OFDM symbol position information of the R-PDSCH or the number of OFDM symbols occupied by the PDCCH of the base station to the UE, or the number of OFDM symbols occupied by the R-PDCCH is learned by higher layer signaling.

8. A base station, comprising:

The base station according to claim 8, wherein the determining module is specifically configured to determine, according to the number of OFDM symbols occupied by the PDCCH of the base station to the UE and the number of OFDM symbols occupied by the R-PDCCH, determine the R-PDSCH Start OFDM symbol position.

The base station according to claim 9, further comprising:

An acquiring module, configured to learn the number of 0FDM symbols occupied by the PDCCHs of the relay nodes to the UE; The determining module is specifically configured to determine, according to the number of OFDM symbols occupied by the PDCCH of the base station to the UE, the number of OFDM symbols occupied by the R-PDCCH, and the number of OFDM symbols occupied by the PDCCH of each relay node to the UE, The starting OFDM symbol position of the R-PDSCH of each relay node.

The base station according to claim 9 or 10, wherein the sending module is specifically configured to use the OFDM symbol number occupied by the R-PDCCH by using one set of source information of two sets of source information of the R-PCFICH. Sending to each of the relay nodes; another set of source information of the two sets of source information is used to start OFDM symbol position information of the R-PDSCH or OFDM symbols occupied by the PDCCH of the base station to the UE Sent to the relay nodes;

Or the OFDM symbol number occupied by the R-PDCCH and the starting OFDM symbol position information of the R-PDSCH, or the R-PDCCH occupied by the R-PDCCH, by using a set of jointly encoded source information of the R-PCFICH. Transmitting the number of OFDM symbols and the number of OFDM symbols occupied by the PDCCH of the base station to the UE to the relay nodes;

Or, specifically, the starting OFDM symbol position information of the R-PDSCH or the number of OFDM symbols occupied by the PDCCH of the base station to the UE by adding a DCI format in the R-PDCCH or by adding a bit number in the DCI format. And sending to the relay nodes, or sending the number of OFDM symbols occupied by the R-PDCCH to the relay nodes by using high layer signaling.

12. A relay node device, comprising:

And a start symbol obtaining module, configured to learn, according to the starting OFDM symbol position information of the R-PDSCH, a starting OFDM symbol position of the R-PDSCH, or according to the OFDM symbol number occupied by the R-PDCCH and a base station to The number of 0FDM symbols occupied by the PDCCH of the UE obtains the starting 0FDM symbol position of the R-PDSCH.

The relay node device according to claim 12, wherein the receiving module is specifically configured to receive the 0FDM symbol occupied by the R-PDCCH by using one set of source information of two sets of source information of the R-PCFICH. Receiving, by another set of source information of the two sets of source information, starting OFM symbol position information of the R-PDSCH or the number of 0FDM symbols occupied by the PDCCH of the base station to the UE;

Or, specifically, used, by using a set of jointly encoded source information of the R-PCFICH, to receive the number of 0FDM symbols occupied by the R-PDCCH and the starting 0FDM symbol position information of the R-PDSCH, or the R-PDCCH occupied by the R-PDCCH The number of 0FDM symbols and the number of 0FDM symbols occupied by the PDCCH of the base station to the UE;

Or, by using the DCI format added in the R-PDCCH or the number of bits added in the DCI format, receiving the initial 0FDM symbol position information of the R-PDSCH or the number of 0FDM symbols occupied by the PDCCH of the base station to the UE, or The upper layer signaling is received to learn the number of 0FDM symbols occupied by the R-PDCCH.