WO2013044517A1

WO2013044517A1 - Uplink signal transmission method, user equipment and base station in coordinated multi-point system

Info

Publication number: WO2013044517A1
Application number: PCT/CN2011/080491
Authority: WO
Inventors: 徐月巧; 王轶; 张元涛; 周华
Original assignee: 富士通株式会社
Priority date: 2011-09-30
Filing date: 2011-09-30
Publication date: 2013-04-04
Also published as: CN103636245A

Abstract

The embodiments of the present invention provide an uplink signal transmission method, User Equipment (UE), and base station in a Coordinated Multi-point (CoMP) system. The uplink signal transmission method comprises that: a UE transmits uplink signals to a service point and a cooperating point, wherein the uplink signals transmitted by the UE maintain orthogonal to the uplink signals transmitted by the other UEs served by the cooperating point. The embodiments of the present invention can further decrease interferences between the UEs of neighbor cells, thus ensuring the performance of CoMP Multi-point reception.

Description

Uplink signal transmission method, user equipment and base station in cooperative multipoint system

The present invention relates to the field of communications, and in particular, to an uplink signal transmission method, a user equipment, and a base station in a coordinated multipoint system. Background Art In an LTE-Advanced (LTE-A) system, Coordinated Multi-point Transmission/Reception (CoMP) is included as one of the key technologies in the LTE-A framework. The coordinated multi-point transmission scenario uses the geographically adjacent transmission points to cooperatively transmit signals to the user, and especially for the cell edge users, the signal quality is improved and the coverage is expanded. In the CoMP scenario, the point of participation in data transmission/reception (TP/RP, Transmission Point/Reception Point) can be divided into the monthly service node serving point (similar to the servant cell in the LTE Rel-8). Cooperating point.

In the process of standardizing CoMP, the research points of UL CoMP are clarified. The important point is the enhancement of Physical Uplink Control Channel (PUCCH), including the improvement of resource utilization and the avoidance of strong interference between cells. . Existing PUCCH format 1/la/lb inter-cell interference for HARQ-ACK transmission is performed by cell-specific Cyclic Shift hopping method to perform interference randomization to ensure users in each cell. Transmit PUCCH performance.

However, in the process of implementing the present invention, in a coordinated multipoint system with different cell identities, for a case where a plurality of UL CoMP points (including an eNB, an RRH, etc.) receive a PUCCH signal of a CoMP UE, CoMP cannot be guaranteed. The orthogonality of the uplink transmission signals of the UE and other UEs, so that the interference of the neighboring cell UE cannot be further reduced, and the performance of CoMP multipoint reception cannot be guaranteed.

It should be noted that the above description of the technical background is only for the purpose of facilitating the clear and complete description of the technical solutions of the present invention, and is convenient for understanding by those skilled in the art. The above technical solutions are not considered to be well known to those skilled in the art simply because these aspects are set forth in the background section of the present invention. Summary of the invention

An embodiment of the present invention provides an uplink signal transmission method, a user equipment, and a base station in a coordinated multipoint system, and aims to: reduce cooperation in a coordinated multipoint system with different cell identifiers for user equipment that receives uplink signals at multiple points. The interference from the user equipment served by the cell.

According to an aspect of an embodiment of the present invention, an uplink signal transmission method in a coordinated multipoint system is provided, wherein the coordinated multipoint system includes a service node and a cooperation node having different cell identifiers, and the service node and the collaboration The user equipment served by the node; the uplink signal transmission method includes:

The user equipment transmits an uplink signal to the serving node and the cooperation node, wherein an uplink signal transmitted by the user equipment is orthogonal to an uplink signal transmitted by other user equipments served by the cooperation node.

According to still another aspect of the embodiments of the present invention, an uplink signal transmission method in a coordinated multipoint system is provided, wherein the coordinated multipoint system includes a service node and a cooperation node having different cell identifiers, and by the service node and a user equipment served by the collaboration node; the uplink signal transmission method includes:

The serving node receives an uplink signal transmitted by the user equipment, where an uplink signal transmitted by the user equipment is orthogonal to an uplink signal transmitted by other user equipments served by the cooperation node.

According to still another aspect of the embodiments of the present invention, a user equipment is provided, which is applied to a coordinated multipoint system, where the coordinated multipoint system further includes a service node and a collaboration node having different cell identifiers;

An uplink signal transmission unit that transmits an uplink signal to the serving node and the cooperating node, wherein the uplink signal is orthogonal to an uplink signal transmitted by other user equipments served by the cooperating node.

According to still another aspect of the present invention, a base station is provided for use in a coordinated multipoint system, wherein the coordinated multipoint system further includes a cooperative node having a different cell identity from the base station, and the base station And a user equipment served by the collaboration node; the base station includes: An uplink signal receiving unit receives an uplink signal transmitted by the user equipment, where an uplink signal transmitted by the user equipment is orthogonal to an uplink signal transmitted by other user equipments served by the cooperation node.

According to still another aspect of the embodiments of the present invention, a computer readable program is provided, wherein when the program is executed in a user equipment, the program causes a computer to execute an uplink signal transmission method as described above in the user equipment .

According to still another aspect of an embodiment of the present invention, a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform an uplink signal transmission method as described above in a user equipment.

According to still another aspect of an embodiment of the present invention, a computer readable program is provided, wherein when the program is executed in a base station, the program causes a computer to perform an uplink signal transmission method as described above in the base station.

According to still another aspect of an embodiment of the present invention, a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform an uplink signal transmission method as described above in a base station.

An advantageous effect of the embodiment of the present invention is that, for a coordinated multipoint system with different cell identifiers, the uplink transmission signal of the user equipment that performs multi-point cooperation and the uplink transmission signal of the user equipment served by the cooperation node are orthogonal, The interference of the user equipment of the neighboring cell can be further reduced, thereby ensuring the performance of CoMP multipoint reception.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings. It should be understood that the embodiments of the invention are not limited in scope. The embodiments of the present invention include many variations, modifications, and equivalents within the scope of the appended claims.

Features described and/or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, in combination with, or in place of, features in other embodiments. .

It should be emphasized that the term "comprising" or "comprising", when used herein, refers to the presence of a feature, component, step or component, but does not exclude the presence or addition of one or more other features, components, steps or components. DRAWINGS

Many aspects of the invention can be better understood with reference to the following drawings. The components in the figures are not drawn to scale, but only to illustrate the principles of the invention. In order to facilitate the illustration and description of some parts of the invention, the corresponding parts in the figures may be enlarged or reduced.

Elements and features described in one of the figures or an embodiment of the invention may be combined with elements and features illustrated in one or more other figures or embodiments. In the accompanying drawings, like reference numerals refer to the

1 is a schematic diagram of a heterogeneous network in which a low-power RRH having different cell IDs exists in a macro cell;

2 is a schematic diagram of inter-cell interference of a PUCCH sent by a coordinated multi-point receiving in an uplink CoMP scenario;

3 is a schematic diagram of a frame structure of a PUCCH format 1/la/lb with a regular cyclic prefix; FIG. 4 is a schematic diagram of a PUCCH format 1/la/lb between user equipments in a cell being orthogonal to each other in a data region and a pilot region, respectively. ;

5 is a flowchart of an uplink signal transmission method according to Embodiment 1 of the present invention;

6 is still another flowchart of the uplink signal transmission method according to Embodiment 1 of the present invention; FIG. 7 is still another flowchart of the uplink signal transmission method according to Embodiment 1 of the present invention; FIG. 8 is an uplink signal transmission according to Embodiment 2 of the present invention; FIG. 9 is a flowchart of an uplink signal transmission method according to Embodiment 2 of the present invention; FIG. 10 is a schematic diagram of orthogonality of physical resources implemented by the FDM method according to Embodiment 2 of the present invention; A schematic diagram of the configuration of the user equipment of Embodiment 3;

FIG. 12 is still another schematic structural diagram of a user equipment according to Embodiment 3 of the present invention; FIG.

Figure 13 is a block diagram showing the structure of a base station according to Embodiment 4 of the present invention;

Figure 14 is a block diagram showing still another configuration of a base station according to Embodiment 4 of the present invention.

detailed description

The foregoing and other features of the invention will be apparent from the In the specification and the drawings, specific embodiments of the invention are specifically disclosed, which The present invention is not limited to the described embodiments, but the invention includes all modifications, variations and equivalents falling within the scope of the appended claims. .

In the 3GPP LTE-A standardization process, four scenarios are defined for the uplink and downlink CoMP (UL/DL CoMP): (1) CoMP (homogenous network with intra-site CoMP); (2) A homogeneous network of high-power radio remote units (RRHs); (3) heterogeneous network scenarios with different cell IDs for low-power RRHs distributed in macro cell range; (4) macro-cell range distribution low-power RRH A heterogeneous network scenario with the same cell ID.

In these four scenarios, the cells/points that constitute the CoMP set in the first three CoMP scenarios have different cell IDs. For convenience of description, it is referred to herein as inter-cell CoMP (inter-cell CoMP).

Taking CoMP scenario 3 as an example, FIG. 1 is a schematic diagram of a heterogeneous network in which a low-power RRH having different cell IDs exists in a macro cell coverage. As shown in Figure 1, the low-power RRH coexists in the coverage of the macro-cell base station, but the RRH and the eNB have different cell IDs.

The embodiment of the present invention is only described by using the CoMP scenario 3 in the LTE-A system shown in FIG. 1 as an example, but it should be noted that the embodiment of the present invention is not limited thereto, and may be applicable to any cooperation with different cell identifiers. Point system.

The embodiment of the present invention relates to a small-area interference problem of a physical uplink control channel (PUCCH, Physical Uplink Control Channel) format 1/1 a/lb for HARQ-ACK transmission in a UL CoMP scenario. The following describes the data area of the PUCCH format 1/la/lb as an example. However, the present invention is not limited to the PUCCH, and can be applied to any other uplink signal transmission.

2 is a schematic diagram of inter-cell interference of a PUCCH in an uplink CoMP scenario. As shown in FIG. 2, in the CoMP scenario 3, there are multiple low-power RRHs of different cell IDs within the coverage of the macro eNB. The uplink PUCCH signal of the UE1 of the user equipment (UE, User Equipment) at the edge of the RRH1 coverage is jointly received by the macro eNB and the RRH1. At this time, the user equipment UE2 of the traditional single-point service within the coverage of the RRH1 is scheduled to be on the same resource block (RB), thereby causing interference to the CoMP UE1.

In the UL CoMP scenario, the macro eNB is the serving node, RRH1. It is a cooperating point. In general, the path loss (PL, Pathloss) between the cooperative node and the CoMP UE is larger than that of the serving node to the CoMP UE, which is more susceptible to interference.

Therefore, when there is a user equipment that transmits an uplink control signal on the same time-frequency resource in the coverage of the cooperative node, for example, UE2 in FIG. 2, the PUCCH signal transmitted by the UE causes interference to the PUCCH signal of the CoMP UE1, thereby deteriorating cooperation. The node RRH1 demodulates the PUCCH signal of the CoMP UE1, and the gain of the multipoint reception under the UL CoMP is small.

In the existing LTE Rel-8/9/lO standard, PUCCH format 1/la/lb is used for HARQ-ACK bit transmission. 3 is a schematic diagram of a PUCCH format 1/la/lb frame structure having a regular cyclic prefix (CP), as shown in FIG. 3, a pilot signal (DMRS) for data demodulation in one slot (slot). , demodulation reference signal ) occupying the middle three SC-FDMA signals, the PUCCH data area occupies 4 symbols.

Table 1 shows the PUCCH format 1/la/lb intra-cell and inter-cell interference cancellation method, as shown in Table 1: The PUCCH format 1/la/lb resource passes through the Physical Downlink Control Channel (PDCCH). The indicated minimum CCE sequence number n _CCE and the N^ _OT indicated by the high layer signaling are jointly determined, that is, the resource sequence number allocated to the user for transmitting the PUCCH format 1/la/lb is _w H _eH = n _{CCE +} N _CCH .

The PUCCH format 1/la/lb for the HARQ-ACK transmission in the next cell of the conventional CP passes through six cyclic shifts (CS, cyclic shift) and three orthogonal sequences of length 4 (orthogonal). Sequences can support simultaneous co-frequency resource transmission of 18 PUCCH formats 1/la/lb on 1 RB, and at the same time, CS-hopping between cell-specific SC-FDMA symbols (Cell-specific CS hopping over SC- FDMA symbol) achieves randomization of interference between cells. Table 1

PUCCH format resource indication small area interference cancellation small interval interference randomization

( Resource index)

Format 1/la/lb n ⁽¹⁾ = n + N ⁽¹⁾ Under normal CP, 6 CS values, cell-specific SC-FDMA

3 orthogonal sequences of length 4 between CS jumps

Column; orthogonality of 18 UEs Figure 4 shows a schematic diagram of PUCCH format 1/la/lb mutually orthogonal among users in a cell. As shown in Figure 4, two cells with the same cell identity in one cell are scheduled to the same time-frequency resource. The same base sequence is used when transmitting PUCCH format 1/la/lb. In the case where two users adopt the same cyclic shift, PUCCH format 1 of UE1 and UE2 can be made by different orthogonal codes (OCC, Orthogonal Cover Code). /la/lb is multiplexed and orthogonal in CDM mode.

For a heterogeneous network with different cell identifiers, the PUCCH sequence (including the data region and the DMRS region) that is orthogonal between the CoMP UE and the cooperating node user can be designed to eliminate interference of the CoMP UE by the user of the cooperative node, thereby improving the uplink. The CoMP scene receives the performance of the PUCCH signal at multiple points.

Example 1

Embodiments of the present invention provide an uplink signal transmission method in a coordinated multipoint system, where a coordinated multipoint system includes a service node and a collaboration node having different cell identifiers, and a user equipment served by the service node and the collaboration node. The uplink signal transmission method will be described below from the user equipment side.

FIG. 5 is a flowchart of an uplink signal transmission method according to an embodiment of the present invention. As shown in FIG. 5, on the user equipment side, the uplink signal transmission method includes:

Step 501: The user equipment transmits an uplink signal to the serving node and the cooperation node, where the uplink signal transmitted by the user equipment is orthogonal to the uplink signal transmitted by other user equipments served by the cooperation node.

The serving node may be a macro cell base station, and the cooperative node may be an RRH, and the serving node and the cooperative node have different cell identifiers. However, it is not limited thereto, for example, the service node and the cooperation node may both serve the macro cell base station to jointly serve the user equipment. The specific composition of the coordinated multipoint system can be determined according to the actual situation.

In an embodiment, orthogonality between the CoMP UE and the UE served by the cooperative node may be implemented by using Code Division Multiplexing (CDM). The CoMP UE and the UE served by the cooperating node are scheduled to use the same time-frequency resource.

FIG. 6 is still another flowchart of an uplink signal transmission method according to an embodiment of the present invention. As shown in FIG. 6, on the user equipment side, the uplink control channel transmission method includes:

Step 601, processing a cyclic shift of the user equipment, so that the symbol is used on each symbol. The difference between the hopping value of the cyclic shift of the household device and the hopping value of the cyclic shift of other user equipments served by the cooperative node is unchanged;

Step 602: The user equipment transmits an uplink signal to the serving node and the cooperation node according to the processed cyclic shift and an orthogonal sequence different from other user equipments.

The UE2 shown in FIG. 2 and the other user equipments served by the cooperative node are exemplified by the UE2 shown in FIG. 2 as an example. As shown in FIG. 2, the PUCCH signal sent by the UE1 is received by the macro eNB and the RRH1, and the UE2 belongs to the single-point service user of the RRH1 coverage.

Taking the PUCCH data area transmitted on the first time slot of one subframe, that is, slot #0, as an example, assuming one antenna port, P = l, the PUCCH signal transmitted by UE1 is: z ₁ (12 -\-n) = S ₁ -w ₁ (m) · y ₁ {n),

Where 4 is a complex-valued modulation symbol modulated by BPSK/QPSK of 1-bit or 2-bit ACK/NACK information transmitted by UE1 in PUCCH format 1/la/lb; S is a scrambled signal of UE1 on slot#0 ; is a cell-specific base sequence generated by the Zad-off Chu sequence, the sequence length is N _S ^CT =12 on one RB, and the base sequence is unchanged in one time slot; N _s ^p _F ^ueeH = 4 indicates the conventional PUCCH format 1/la/lb The number of SC-FDMA symbols occupied in each slot of a subframe. And, A, /) is a cyclic shift CS value of the UE1 PUCCH base sequence, which is hopped on the SC-FDMA on each slot, is a slot number, / is an SC-FDMA symbol number, for PUCCH format 1 /la/lb data transmission, in a time slot, the corresponding SC-FDMA symbol number is Z = {0,1,2,6}; w _x = { _Wl (m) I m = 0,1,... , N _S ^P _F ^UCCH -1} i The orthogonal sequence of length A ^∞H used by UE1 to transmit PUCCH data symbols on slot #0. Similarly, UE2 sends a PUCCH data signal similar expression can be: (12 + = S ₂ . w ₂ (m) . y ₂ (wy ₂ (") ²⁽ ''"(") = · ²⁽ '' ( "

m = 0,...,N _s ^P _F ^UCCH -l

" = 0,..., ^CCH - 1, ^CCH =12 On slot #0, the cross-correlation of the PUCCH data signals of UE1 and UE2 is:

Ψ Χ ^{-1 -1}

= ∑ (W _SEQ xm + n)z ₂ (N _seq xm + n) + (W _SEQ xm + n)z ₂ (N _seq xm + n) +

∑ (N _s ^P r ^H + ") *( ^CH ∑ (A ^CH + ") *(A ^CH x _{+ W)} + (12 + ra) * (12 + ?Ϊ) + (24 + ?Ϊ) * ( 24 + ra) + (36 + ra) * (36 + ra)

Further, equation (3) can be converted to ^ψ = (") + ∑ (12 + ") 3⁄4 * (l ² + ") + ∑ ( ²⁴ + ") 3⁄4 * ( ²⁴ + ") + ∑ (36 + w) _3⁄4 *(36 + /i)

^5 ₁ 5 _{2 1} (m)w ₂ (m)J ₁ ii ₂ *e ^; ' ^(Gill ~ ^Gi2l) ' ¹ (/i)^(/i)* + ^5 ₁ 5 _{2 1} (m)w ₂ (m)J ₁ J^ ^;(ffl2 ~ ^Gi22) ' ¹ (/i)^(/i)*

+ ^5 ₁ 5 _{2 1} (m)w ₂ (m)J ₁ J ₂ *e ^;(Gil3 ~ ^Gi23) ' ¹ (/i)^(/i)* + ^5 ₁ 5 _{2 1} m)w ₂ (m) J ₁ J ₂ *e ^{; (Gil4} ~ ^Gi24) ' ¹ (/i)^(/i)*

(4) where {a _u , a ₁₂ , a ₁₃ , a ₁₄ } and { { ₂₁ , α ₂₂ , α ₂₃ , α ₂₄ } represent the sequence 歹ϋ used by UE1 and UE2 in PUCCH format 1/la/ The CS hop value on the four SC-FDMAs in the data area of lb.

In this embodiment, when the step 601 is implemented, the cyclic shift of the user equipment may be processed, so that the hopping value of the cyclic shift of the user equipment on each symbol, and other user equipments served by the cooperative node The difference between the transition values of the cyclic shift does not change.

Taking the above UE1 and UE2 as an example: _u - a ₂₁ = a _l2 - ₂₂ = a _l3 - ₂₃ = a _l4 - ₂₄ = Aa Thus, equation (4) can be further expressed as:

Because

UE1 and UE2 use different orthogonal sequences, that is, and ^ ₂ are orthogonal to each other, so that ^^^ ¹ ^^^^^^ ¹ ^^)^^^. Therefore, the orthogonality between UE1 and UE2 can be finally realized. .

In an embodiment, the step 601 may specifically include: turning off the cyclic shift, stopping the cyclic shift of the user equipment, and other user equipments of the cooperative node service scheduled to the same time-frequency resource as the user equipment. . That is, for the user equipment, an instruction sent by the service node to stop the cyclic shift of the user equipment may be received; according to the instruction, the cyclic shift of the user equipment is turned off.

Specifically, the CS hopping of each user equipment can be turned off, g 卩 UE-specific CS hopping disabling, it 匕 day, a = a _l2 = a ₁₃ = a _u , a _2l = a ₂₂ = a ₂₃ = a ₂₄ Thus

= Aa.

In a specific implementation, the serving node may send an indication to the user equipment (for example, UE1) to disable the CS hopping, which may be indicated by higher layer signaling. After receiving the indication, the user equipment turns off the CS hopping function of the PUCCH format 1/la/lb. At the same time, the serving node sends an indication of turning off the CS hopping to the cooperating node through the backhaul interaction mode of the fiber connection/X2 interface, etc., after receiving the indication, the coordinating node dispatches the user to the same time-frequency resource that is served by the UE1. The device (eg, UE2) sends an indication to turn off the CS hop, which can be indicated by higher layer signaling. After receiving the indication, the user equipment of the coordinated cell turns off the CS hopping function of the PUCCH format 1/la/lb sent by the user equipment. However, it is not limited to this, and the specific implementation method can be determined according to the actual situation.

In another embodiment, the step 601 may include: receiving, by the user equipment, a cell identifier of the coordinated node sent by the serving node; performing, according to the received cell identifier of the coordinated node, a cycle related to the coordinated node cell identifier on each symbol. Shifting of the shift.

In a specific implementation, the UE1 and the UE2 are still used as an example, and the serving node macro eNB where the CoMP UE1 is located may notify the CoMP UE1 in a dynamic or semi-static manner, and the CoMP UE1 may perform user-specific CS hopping, ie UE-specific CS hopping. According to Rel-8/9/10, the cell-specific CS hopping of users in each cell is achieved by:

(" _s , / ) + ";(" _s ) · AST + (n^ (n _s ) mod ) mod N' modN , regular CP n (n ) + [n'M- - ATM ^H + nJ( ) (n _s )/2 ) mod N' modN , extended CP

(6) From (6), the change of CS on each SC-FDMA per UE on a slot depends on the parameter / ^u (" _s , /); and ^ , ^^^^^^^") Wherein, the initial value of the pseudo-random sequence is determined by the cell ID, that is, _Cmit = NS ¹¹ .

In this embodiment, after obtaining the cell identifier (RRH1_ID) of the RRH1, the CoMP UE1 does not perform the specific CS hopping of the macro eNB cell identifier, and the hop value is determined according to the cell identifier of the RRH1, thereby performing the user-specific CS hopping, so that the CS hopping of UE1 on the SC-FDMA symbol depends on the U(, determined by the RRH1 cell ID).

· 3⁄4+8 + '·) -2' (where c _init = NRRHi ro ).

UE2 performs cell-specific CS hopping compatible with LTE Rel-8/9/10, that is, cell-specific CS hopping, and g 卩 UE2 performs CS hopping, c _init = N^ _mjD .

Thus, the variation of the CS of CoMP UE1 on each SC-FDMA in one slot is equal to the variation of the CS of UE2 on each SC-FDMA in one slot, ie a _2l + , and so on.

Therefore, through the specific CS hopping of CoMPUE1, the CS relationship between UE1 and UE2 on each SC-FDMA symbol can be satisfied:

Thus ψ = ( _Wi w ₂ ^T )^ SS^d^e^T^n)^ {n) = 0. It can be seen from the foregoing embodiment that, for the code division multiplexing mode, the cyclic shift of the user equipment is processed, so that the hopping value of the cyclic shift of the user equipment on each symbol, and other user equipments served by the cooperative node The difference between the hopping values of the cyclic shifts is unchanged; at the same time, the two users use different orthogonal codes to ensure the orthogonality of the uplink signal transmission, further reducing the phase Interference from user equipment in the neighboring cell.

In another embodiment, the orthogonality between the CoMP UE and the UE served by the cooperative node may be implemented by using a Frequency Division Multiplexing (FDM) mode.

FIG. 7 is still another flowchart of the uplink signal transmission method according to the embodiment of the present invention. As shown in FIG. 7, the uplink signal transmission method includes:

Step 701: The user equipment performs uplink signal transmission according to the resource sequence number of the resource block used by the serving node to indicate the resource block used by the user equipment for uplink signal transmission, where the resource block indicated by the resource sequence number is different from the coordinated node to other users. The resource block of the device.

In this embodiment, the scenario shown in FIG. 2 is still taken as an example, and the backhaul signaling (such as through a fiber connection or an X2 interface) is exchanged between the primary cell macro eNB constituting the CoMP cell and the cooperative node RRH1, and the CoMP UE1 can be given. And the neighboring cell user equipment allocates different PUCCH resource blocks, thereby implementing orthogonality of the FDM mode.

As shown in FIG. 7, before the uplink signal is transmitted, the uplink transmission method may further include: Step 702: The user equipment receives a resource sequence number that is sent by the service node and is used to indicate a resource block used by the user equipment for uplink signal transmission.

It can be seen from the foregoing embodiment that, for the frequency division multiplexing mode, different resource blocks are allocated to the user equipment served by the CoMP user equipment and the cooperation node; the orthogonality of the uplink control channel transmission can be ensured, thereby further reducing the neighboring Interference from cell user equipment.

Example 2

Embodiments of the present invention provide an uplink signal transmission method in a coordinated multipoint system, where a coordinated multipoint system includes a service node and a collaboration node having different cell identifiers, and a user equipment served by the service node and the collaboration node. The uplink signal transmission method will be described below from the base station side.

FIG. 8 is still another flowchart of an uplink signal transmission method according to an embodiment of the present invention. As shown in FIG. 8, on the base station side, the uplink signal transmission method includes:

Step 801: The serving node receives an uplink signal transmitted by the user equipment, where the uplink signal transmitted by the user equipment is orthogonal to the uplink signal transmitted by other user equipments served by the cooperation node.

In an embodiment, the orthogonality between the CoMP UE and the UE served by the cooperative node may be implemented in a CDM manner. The CoMP UE and the UE served by the cooperative node are tuned To the same time-frequency resources.

In this embodiment, the uplink signal transmitted by the user equipment is sent according to the cyclic shift after processing and an orthogonal sequence different from other user equipments; wherein the hop value of the cyclic shift after processing on each symbol, The difference between the hopping values of the cyclic shifts of other user equipments served by the cooperative node is unchanged.

In an embodiment, before the step 801, the uplink signaling method may further include: turning off the CS hopping of each user equipment. That is, the serving node may send an instruction to stop the cyclically shifted hop to the cooperating node and the user equipment to turn off the cyclic shift of the user equipment and other user equipments served by the cooperative node occupying the same time-frequency resource as the user equipment. In another embodiment, before the step 801, the uplink signal transmission method may further include: the serving node sending the cell identifier of the cooperation node to the user equipment, so that the user equipment performs a cyclic shift hop according to the cell identifier of the cooperation node.

It can be seen from the foregoing embodiment that, for the code division multiplexing mode, the cyclic shift of the user equipment is processed, so that the hopping value of the cyclic shift of the user equipment on each symbol, and other user equipments served by the cooperative node The difference between the hopping values of the cyclic shifts is unchanged; at the same time, the two user equipments adopt different orthogonal codes, thereby ensuring the orthogonality of the uplink transmission signals and further reducing the interference of the user equipment of the neighboring cells.

In another embodiment, the orthogonality between the CoMP UE and the UE of the cooperative node service may be implemented in an FDM manner.

FIG. 9 is still another flowchart of the uplink signal transmission method according to the embodiment of the present invention. As shown in FIG. 9, the uplink signal transmission method includes:

In step 901, the serving node sends a resource sequence number of the resource block used for the uplink signal transmission by the user equipment to the user equipment, so that the user equipment performs uplink signal transmission on the resource block indicated by the resource sequence number; The resource block indicated by the resource sequence number is different from the resource block allocated by the cooperation node to other user equipments.

In this embodiment, the scenario shown in FIG. 2 is still taken as an example, and the backhaul signaling (such as through a fiber connection or an X2 interface) is exchanged between the primary cell macro eNB constituting the CoMP cell and the cooperative node RRH1, and the CoMP UE1 can be given. And the neighboring cell user equipment allocates different PUCCH resource blocks, thereby implementing orthogonality of the FDM mode. FIG. 10 is a schematic diagram of orthogonalizing physical resources by using the FDM method according to an embodiment of the present invention. As shown in FIG. 10, the CoMP user equipment and the neighbor cell user equipment may be allocated different PUCCH resource blocks.

In an embodiment, before the step 901, the uplink signal transmission method may further include: the serving node sends the resource sequence number of the resource block used for instructing the user equipment to perform uplink signal transmission to the cooperation node, so that the collaboration node is allocated. The resource avoids allocating the resource block indicated by the resource sequence number to the user serving its own cell.

In a specific implementation, it may be similar to the PUCCH format 2/2a/2b and the PUCCH format 3, and the CoMP UE1 PUCCH format 1/la/lb transmission resource is used to notify the user through high layer signaling, and the service node macro eNB where the CoMP UE1 is located will be CoMP. The i _eeH used by the _UE1 tells the CoMP UE's cooperating node _RRH1 through the backhaul mode (such as the fiber connection or the X2 interface), and the RRH1 separates from the CoMP UE1 from the RB resource block when scheduling the PUCCH resource of the UE (for example, UE2) of its own cell. .

In another embodiment, before the step 901, the PUCCH format 1/la/lb transmission method may further include: the serving node includes a resource sequence number indicating a resource block used by the user equipment to perform the uplink control channel transmission. The resource set is sent to the cooperation node, so that the cooperation node avoids allocating the resource block indicated by the resource sequence number to the user serving its own cell when allocating resources.

In a specific implementation, for example, a set of resources { CCH4 C - ^ _Η , Λ ^ is given to CoMP UE1 in a semi-static manner, and the set of resource information is communicated to the cooperative node of CoMP UE1 through a backhauK such as a fiber connection or an X2 interface. When the PUCCH resource of the user equipment (for example, UE2) of the own cell is scheduled, the RRH1 is separated from the CoMP UE1 by the physical resource.

Example 3

The embodiment of the present invention provides a user equipment, which is applied to a coordinated multipoint system, where the coordinated multipoint system further includes a service node and a collaboration node having different cell identifiers. The same content as the method in Embodiment 1 above is not described herein. FIG. 11 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. As shown in FIG. 11, the user equipment includes: an uplink signal transmission unit 1101. The uplink signal transmission unit 1101 transmits an uplink signal to the serving node and the cooperation node, where the uplink signal is orthogonal to the uplink signal transmitted by other user equipments served by the cooperation node.

In one embodiment, the orthogonality between the CoMP UE and the UE served by the cooperative node may be implemented in a CDM manner. The CoMP UE and the UE served by the cooperating node are scheduled to use the same time-frequency resource.

FIG. 12 is still another schematic diagram of the configuration of the user equipment according to the embodiment of the present invention. As shown in FIG. 12, the user equipment includes: a cyclic shift processing unit 1201 and an uplink signal transmission unit 1202.

The cyclic shift processing unit 1201 processes the cyclic shift of the user equipment, so that the hopping value of the cyclic shift of the user equipment on each symbol, and the cyclic shift of other user equipments served by the cooperative node The difference between the hopping values is unchanged; the uplink signal transmission unit 1202 transmits an uplink signal to the serving node and the coordination point according to the processed cyclic shift and the orthogonal sequence different from other user equipments.

In an embodiment, the cyclic shift processing unit 1201 may specifically include: a shutdown instruction receiving unit that receives an instruction sent by the service node to stop a cyclic shift of the user equipment; and a cyclic shift off unit, according to the instruction The jump of the cyclic shift of the user equipment.

In a specific implementation, the cyclic shift off unit may turn off its CS jump function after receiving the indication of the closed CS transition sent by the serving node. Other user equipment (such as UE2) can also turn off its CS transition function after receiving an indication that the cooperative node (such as RRH1) sends off the CS transition.

In another embodiment, the cyclic shift processing unit 1201 may specifically include: a cell identity receiving unit that receives a cell identity of the cooperation node sent by the service node; a cyclic shift hopping unit, according to the received cell of the cooperation node Identification, a jump that is cyclically shifted on each symbol.

It can be seen from the foregoing embodiment that, for the code division multiplexing mode, the cyclic shift of the user equipment is processed, so that the hopping value of the cyclic shift of the user equipment on each symbol, and other user equipments served by the cooperative node The difference between the hopping values of the cyclic shifts is unchanged; at the same time, the two user equipments adopt different orthogonal codes, thereby ensuring the orthogonality of the uplink transmission signals and further reducing the interference of the user equipment of the neighboring cells. In another embodiment, the orthogonality between the CoMP UE and the UE served by the cooperative node may be implemented in an FDM manner. The uplink signal transmission unit 1101 may specifically include: transmitting, according to the resource sequence number of the resource block used by the serving node to indicate the resource block used by the user equipment for uplink signal transmission, where the resource block indicated by the resource sequence number is different from the coordinated node. A resource block that is assigned to other user devices.

In a specific implementation, the user equipment may further include: a resource sequence number receiving unit, where the resource sequence number sent by the service node for indicating the resource block used by the user equipment for uplink signal transmission is received.

Example 4

The embodiment of the present invention further provides a base station, which is applied to a coordinated multipoint system, where the coordinated multipoint system further includes a cooperation node having a cell identity different from the service node, and a user equipment served by the base station and the collaboration node. . The same as the method in the above embodiment 2, and details are not described herein again.

FIG. 13 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 13, the base station includes: an uplink signal receiving unit 1301. The uplink signal receiving unit 1301 receives the uplink signal transmitted by the user equipment, where the uplink signal transmitted by the user equipment is orthogonal to the uplink signal transmitted by other user equipments served by the cooperative node.

The uplink signal receiving unit 1301 receives the uplink signal sent by the user equipment according to the processed cyclic shift; wherein, on each symbol, the processed cyclic shift hop value and other user equipments served by the cooperative node The difference between the transition values of the cyclic shifts is constant.

In an embodiment, the base station may further include: a shutdown instruction sending unit that sends an instruction to stop the cyclic shifting hopping to the cooperation node and the user equipment to turn off the cyclic shift of the user equipment and other user equipments Jump.

In another embodiment, the base station may further include: a cell identifier sending unit, It sends the cell identifier of the cooperation node to the user equipment, so that the user equipment performs a cyclic shift hop according to the cell identifier of the cooperation node.

It can be seen from the foregoing embodiment that, for the code division multiplexing mode, the cyclic shift of the user equipment is processed, so that the hopping value of the cyclic shift of the user equipment on each symbol, and other user equipments served by the cooperative node The difference between the hopping values of the cyclic shifts is unchanged; the orthogonality of the uplink transmission signals can be ensured, thereby further reducing the interference of the user equipment of the neighboring cells.

FIG. 14 is a schematic diagram of still another structure of a base station according to an embodiment of the present invention. As shown in FIG. 14, the base station 1400 includes: an uplink signal receiving unit 1401 and a resource sequence number transmitting unit 1402.

The resource sequence number sending unit 1402 sends a resource sequence number for indicating a resource block used by the user equipment to perform uplink control channel transmission to the user equipment, so that the user equipment performs uplink control channel transmission on the resource block indicated by the resource sequence number. . The uplink signal receiving unit 1401 receives the uplink signal transmitted by the user equipment, wherein the uplink signal is a transmission performed on the resource block indicated by the resource sequence number. The resource block indicated by the resource sequence number is different from the resource block allocated by the cooperation node to other user equipments.

In an embodiment, the base station may further include: a first sending unit, configured to send, to the cooperative node, a resource sequence number used by the user equipment to perform resource block for performing uplink signal transmission, so that the cooperative node avoids allocating the resource when allocating resources The resource block indicated by the resource number.

In another embodiment, the base station may further include: a second sending unit, configured to send, to the cooperation node, a resource set that includes a resource sequence number used by the user equipment to perform uplink signal transmission, so that the coordinated node is allocated Avoid resource allocations indicated by the resource sequence number when the resource is used.

It can be seen that, in the frequency division multiplexing mode, the CoMP user equipment and the neighboring cell user equipment are allocated different resource blocks; the orthogonality of the uplink control channel transmission can be ensured, thereby further reducing the neighboring cell user equipment. interference.

The embodiment of the present invention also provides a computer readable program, wherein when the program is executed in a base station, the program causes a computer to perform an uplink signal transmission method as described above in the base station.

An embodiment of the present invention further provides a storage medium storing a computer readable program, wherein The computer readable program causes a computer to perform an uplink signal transmission method as described above in a base station.

The embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a user equipment, the program causes a computer to perform an uplink signal transmission method as described above in the user equipment.

Embodiments of the present invention also provide a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform an uplink signal transmission method as described above in a user equipment.

The above apparatus and method of the present invention may be implemented by hardware or by hardware in combination with software. The present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps. The present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.

One or more of the functional blocks described in the figures and/or one or more combinations of functional blocks may be implemented as a general purpose processor, digital signal processor (DSP) for performing the functions described herein. An application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof. One or more of the functional blocks described with respect to the figures and/or one or more combinations of functional blocks may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors One or more microprocessors in conjunction with DSP communication or any other such configuration.

The present invention has been described in connection with the specific embodiments thereof, and it should be understood by those skilled in the art that these descriptions are not intended to limit the scope of the invention. A person skilled in the art can make various modifications and changes to the invention in accordance with the spirit and the principles of the invention, which are also within the scope of the invention.

Claims

Claim

An uplink signal transmission method in a coordinated multipoint system, wherein the coordinated multipoint system includes a service node and a cooperation node having different cell identifiers, and user equipments served by the service node and the collaboration node; The uplink signal transmission method includes:

The uplink signal transmission method according to claim 1, wherein before the user equipment transmits an uplink signal to the serving node and the cooperation node, the uplink signal transmission method further includes:

Processing a cyclic shift of the user equipment such that a hopping value of the cyclic shift of the user equipment on each symbol, a hopping value of a cyclic shift of other user equipment served by the cooperative node The difference is the same;

And, the user equipment transmits an uplink signal to the serving node and the cooperative node according to the cyclic shift after processing and an orthogonal sequence different from the other user equipment.

The uplink signal transmission method according to claim 2, wherein the processing of the cyclic shift of the user equipment specifically includes:

Receiving, by the service node, a hopping to stop a cyclic shift of the user equipment, according to the instruction, turning off a hopping of the cyclic shift of the user equipment.

Receiving, by the serving node, a cell identifier of the coordinated node;

Performing a cyclic shift on each symbol according to the received cell identifier of the coordinated node

,

The uplink signal transmission method according to claim 1, wherein the transmitting, by the user equipment, the uplink signal to the serving node and the cooperation node includes:

The user equipment performs uplink signal transmission according to the resource sequence number of the resource block used by the serving node to indicate that the user equipment performs uplink signal transmission; The resource block indicated by the resource sequence number is different from the resource block allocated by the coordinated node to the other user equipment.

The uplink signal transmission method according to claim 5, wherein, before the uplink signal is transmitted, the uplink transmission method further includes:

The user equipment receives a resource sequence number that is sent by the service node to indicate that the user equipment uses a resource block for uplink signal transmission.

7. An uplink signal transmission method in a coordinated multipoint system, wherein the coordinated multipoint system comprises a service node and a collaboration node having different cell identifiers, and user equipment served by the service node and the collaboration node; The uplink signal transmission method includes:

The uplink signal transmission method according to claim 7, wherein the uplink signal transmitted by the user equipment is sent according to a cyclic shift after processing and an orthogonal sequence different from the other user equipments;

The difference between the hopping value of the processed cyclic shift and the hopping value of the cyclic shift of the other user equipment on each symbol is unchanged.

The uplink signal transmission method according to claim 8, wherein the uplink signal transmission method further includes:

The serving node sends an instruction to stop the cyclic shifting hop to the cooperative node and the user equipment to turn off the cyclic shift of the user equipment and the other user equipment

, ,

And the serving node sends the cell identifier of the coordinated node to the user equipment, so that the user equipment performs a cyclic shift hop according to the cell identifier of the coordinated node.

The uplink signal transmission method according to claim 7, wherein, before receiving the uplink signal transmitted by the user equipment, the uplink transmission method further includes:

The serving node sends a resource sequence number of the resource block used by the user equipment to perform uplink signal transmission to the user equipment, so that the user equipment is according to the resource The uplink signal is transmitted on the resource block indicated by the sequence number;

The resource block indicated by the resource sequence number is different from the resource block allocated by the coordinated node to the other user equipment.

The uplink signal transmission method according to claim 11, wherein the uplink signal transmission method further includes:

The serving node sends a resource sequence number of the resource block used for instructing the user equipment to perform uplink signal transmission to the coordinated node, so that the cooperative node avoids allocating resource blocks indicated by the resource sequence number when allocating resources.

The serving node sends a resource set including a resource sequence number for indicating a resource block used by the user equipment for uplink signal transmission to the cooperation node, so that the cooperation node avoids allocating the resource sequence number when allocating resources Resource block.

A user equipment, which is applied to a coordinated multipoint system, wherein the coordinated multipoint system further includes a service node and a cooperation node having different cell identifiers; the user equipment includes: an uplink signal transmission unit, The serving node and the cooperating node transmit an uplink signal, wherein the uplink signal is orthogonal to an uplink signal transmitted by other user equipment served by the cooperating node.

The user equipment according to claim 14, wherein the user equipment further comprises: a cyclic shift processing unit that processes a cyclic shift of the user equipment such that the user equipment is on each symbol The difference between the hopping value of the cyclic shift and the hopping value of the cyclic shift of other user equipments served by the cooperative node is unchanged;

And, the uplink signal transmission unit transmits an uplink signal to the serving node and the cooperation node according to the cyclic shift after processing and an orthogonal sequence different from the other user equipment.

The user equipment according to claim 15, wherein the cyclic shift processing unit specifically includes:

a shutdown instruction receiving unit that receives an instruction sent by the service node to stop a hopping of the cyclic shift of the user equipment;

Cycling off the unit, turning off the cyclic shift of the user equipment according to the instruction

a cell identifier receiving unit, which receives a cell identifier of the collaboration node sent by the service node;

And a cyclic shift hopping unit that performs a cyclic shift hopping on each symbol according to the received cell identifier of the coordinated node.

The user equipment according to claim 14, wherein the uplink signal transmission unit specifically includes: performing uplink according to a resource sequence number of the resource block used by the serving node to indicate that the user equipment performs uplink signal transmission Signal transmission;

The user equipment of claim 18, wherein the user equipment further comprises: a resource sequence number receiving unit, configured to receive, by the service node, a resource for indicating, by the user equipment, a resource block used for uplink signal transmission Serial number.

20. A base station, for use in a coordinated multipoint system, wherein the coordinated multipoint system further includes a cooperative node having a different cell identity from the base station, and a user equipment served by the base station and the cooperative node; The base station includes:

And an uplink signal receiving unit, which receives an uplink signal transmitted by the user equipment, where an uplink signal transmitted by the user equipment is orthogonal to an uplink signal transmitted by other user equipments served by the cooperation node.

The base station according to claim 20, wherein the base station further comprises: a shutdown instruction sending unit that sends an instruction to stop the cyclic shifting hop to the cooperative node and the user equipment to close the User equipment, and transitions of cyclic shifts of the other user equipment.

The base station according to claim 20, wherein the base station further includes: a cell identity sending unit, configured to send, to the user equipment, a cell identifier of the coordinated node, so that the user equipment is configured according to the collaboration node The cell identifier performs a cyclic shift.

The base station according to claim 20, wherein the base station further comprises: a resource sequence number sending unit, configured to send, to the user equipment, a resource sequence number of the resource block used by the user equipment to perform uplink signal transmission, so that the user equipment performs uplink on the resource block indicated by the resource sequence number Signal transmission;

The base station according to claim 23, wherein the base station further includes: a first sending unit, configured to send, to the cooperative node, a resource sequence number of a resource block used for instructing the user equipment to perform uplink signal transmission, The cooperative node is caused to avoid allocating resource blocks indicated by the resource sequence number when allocating resources.

The base station according to claim 23, wherein the base station further includes: a second sending unit, configured to include a resource set for indicating a resource sequence of a resource block used by the user equipment for uplink signal transmission to The coordinating node sends, so that the cooperating node avoids allocating resource blocks indicated by the resource sequence number when allocating resources.

A computer readable program, wherein the program causes a computer to perform an uplink signal transmission method according to any one of claims 1 to 6 in the user equipment when the program is executed in a user equipment.

A storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform the uplink signal transmission method according to any one of claims 1 to 6 in a user equipment.

A computer readable program, wherein the program causes a computer to perform the uplink signal transmission method according to any one of claims 7 to 13 in the base station when the program is executed in a base station.

A storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform the uplink signal transmission method according to any one of claims 7 to 13 in a base station.