CN103636245A - Uplink signal transmission method, user equipment and base station in coordinated multi-point system - Google Patents

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 coordinated multi-point system Technical field

The present invention relates to a communication field, and in particular to an uplink signal transmission method, user equipment and base station in a coordinated multi-point system. Background Art In the LTE-Advanced (LTE-A) system, Coordinated Multi-point Transmission/Reception (CoMP, Coordinated Multi-point Transmission/Reception) is incorporated into the LTE-A framework as one of the key technologies. In the coordinated multi-point transmission scenario, geographically adjacent transmission points are used to cooperatively send signals to users. For cell-edge users, signal quality can be improved and coverage can be expanded. In the CoMP scenario, the points (TP/RP, Transmission Point/Reception Point) participating in data transmission/reception can be divided into serving point (similar to serving cell in LTE Rel-8) and coordination node cooperating point.

In the process of CoMP standardization, the research points of UL CoMP are clarified, the important point is the enhancement of Physical Uplink Control Channel (PUCCH, Physical Uplink Control Channel), including the improvement of resource utilization and the avoidance of strong inter-cell interference . The existing PUCCH format 1/la/lb inter-cell interference used for HARQ-ACK transmission is through the cell-specific cyclic shift hopping (Cell-specific Cyclic Shift hopping) method, and the interference is randomized to ensure that the users in each cell The performance of transmitting PUCCH.

However, in the process of implementing the present invention, in the coordinated multi-point system with different cell identities, for the situation where multiple UL CoMP points (points) (including eNB, RRH, etc.) receive the PUCCH signal of the CoMP UE, the CoMP cannot be guaranteed Due to the orthogonality of the uplink transmission signals of the UE and other UEs, the interference of UEs in adjacent cells cannot be further reduced, and the performance of CoMP multi-point reception cannot be guaranteed.

It should be noted that the above introduction to the technical background is only for the convenience of a clear and complete description of the technical solution of the present invention, and to facilitate the understanding of those skilled in the art. It cannot be considered that the above technical solutions are known to those skilled in the art just because these solutions are explained in the background technology part of the present invention. Contents of the invention

Embodiments of the present invention provide an uplink signal transmission method, user equipment, and base station in a coordinated multi-point system. The interference of the user equipment served by the cell to it.

According to an aspect of an embodiment of the present invention, a method for transmitting an uplink signal in a coordinated multi-point system is provided, wherein the coordinated multi-point system includes a serving node and a coordinating node with different cell identities, and the serving node and the coordinating node User equipment served by the node; the uplink signal transmission method includes:

The user equipment transmits uplink signals to the serving node and the coordination node, where the uplink signals transmitted by the user equipment are kept orthogonal to the uplink signals transmitted by other user equipments served by the coordination node.

According to yet another aspect of the embodiments of the present invention, there is provided a method for transmitting an uplink signal in a coordinated multi-point system, wherein the coordinated multi-point system includes a serving node and a coordinating node with different cell identities, and the serving node and A user equipment served by a coordinated node; the uplink signal transmission method includes:

The serving node receives the uplink signal transmitted by the user equipment, where the uplink signal transmitted by the user equipment is kept orthogonal to the uplink signal transmitted by other user equipment served by the coordination node.

According to yet another aspect of the embodiments of the present invention, there is provided a user equipment, which is applied in a coordinated multi-point system, wherein the coordinated multi-point system further includes a serving node and a coordination node with different cell identities; the user equipment includes:

an uplink signal transmission unit, which transmits an uplink signal to the serving node and a coordinating node, wherein the uplink signal is kept orthogonal to uplink signals transmitted by other user equipments served by the coordinating node.

According to still another aspect of the embodiments of the present invention, there is provided a base station, which is applied in a coordinated multi-point system, wherein the coordinated multi-point system further includes a coordination node with a cell identity different from that of the base station, and the base station and the user equipment served by the coordination node; the base station includes: an uplink signal receiving unit, which receives the uplink signal transmitted by the user equipment, where the uplink signal transmitted by the user equipment is kept orthogonal to the uplink signal transmitted by other user equipment served by the coordination node.

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

According to yet another aspect of the embodiments of the present invention, there is provided a storage medium storing a computer-readable program, wherein the computer-readable program enables a computer to execute the above-mentioned uplink signal transmission method in a user equipment.

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 the base station, the program causes the computer to execute the above-mentioned uplink signal transmission method in the base station.

According to yet another aspect of the embodiments of the present invention, there is provided a storage medium storing a computer-readable program, wherein the computer-readable program enables a computer to execute the above-mentioned uplink signal transmission method in a base station.

The beneficial effect of the embodiment of the present invention is that, for a coordinated multi-point system with different cell identities, by maintaining the orthogonality between the uplink transmission signal of the user equipment performing coordinated multi-point coordination and the uplink transmission signal of the user equipment served by the coordination node, The interference of user equipments in adjacent cells can be further reduced, thereby ensuring the performance of CoMP multi-point reception.

With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, and the manner in which the principle of the present invention can be adopted is indicated. It should be understood that the embodiments of the present invention are not limited thereby in scope. Embodiments of the present invention encompass many changes, modifications and equivalents within the spirit and scope of the appended claims.

Features described and/or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or substituted for features in other embodiments .

It should be emphasized that the term "comprising/comprising" when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. Description of drawings

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

Elements and features described in one drawing or one embodiment of the present invention may be combined with elements and features shown in one or more other drawings or embodiments. Additionally, in the drawings, like numerals indicate corresponding parts in the several figures and may be used to indicate corresponding parts used in more than one embodiment.

FIG. 1 is a schematic diagram of a heterogeneous network in which there are low-power RRHs with different cell IDs in a macro cell;

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

Figure 3 is a schematic diagram of the frame structure of the PUCCH format 1/la/lb with a conventional cyclic prefix; Figure 4 is a schematic diagram of the orthogonality between the PUCCH format 1/la/lb in the data area and the pilot area between user equipments in a cell ;

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

6 is another flow chart of the uplink signal transmission method in Embodiment 1 of the present invention; FIG. 7 is another flow chart of the uplink signal transmission method in Embodiment 1 of the present invention; FIG. 8 is an uplink signal transmission in Embodiment 2 of the present invention Another flow chart of the method; FIG. 9 is another flow chart of the uplink signal transmission method in Embodiment 2 of the present invention; FIG. 10 is a schematic diagram of implementing physical resource orthogonality in FDM mode in Embodiment 2 of the present invention; FIG. 11 is a schematic diagram of the present invention A schematic diagram of the structure of the user equipment in Embodiment 3;

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

FIG. 13 is a schematic diagram of the structure of a base station according to Embodiment 4 of the present invention;

FIG. 14 is another schematic diagram of the structure of the base station according to Embodiment 4 of the present invention.

Detailed ways

The foregoing and other features of the present invention will become apparent from the following description, taken with reference to the accompanying drawings. In the specification and drawings, specific embodiments of the present invention are disclosed, which show that Having shown some embodiments in which the principles of the present invention may be employed, it should be understood that the present invention is not limited to the described embodiments, but that the present 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 uplink and downlink CoMP (UL/DL CoMP): (1) inter-site CoMP (homogenous network with intra-site CoMP); (2) with Homogeneous network of high transmission power wireless remote unit (RRH, Remote Radio Head); (3) Heterogeneous network scenario with different cell IDs in which low-power RRHs are distributed in a macro cell range; (4) Low-power RRHs are distributed in a macro cell range Heterogeneous network scenarios with the same cell ID.

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

Taking CoMP scenario 3 as an example, FIG. 1 is a schematic diagram of a heterogeneous network in which low-power RRHs with different cell IDs exist within the coverage of a macro cell. As shown in FIG. 1, the low-power RRH coexists in the area covered by the macro cell base station, but the RRH and the eNB have different cell IDs.

This embodiment of the present invention is only described by taking the CoMP scenario 3 in the LTE-A system shown in FIG. point system.

The embodiment of the present invention relates to the inter-cell interference problem of the physical uplink control channel (PUCCH, Physical Uplink Control Channel) format 1/1 a/lb used for HARQ-ACK transmission in the UL CoMP scenario. The data area of PUCCH format 1/1a/1b is taken as an example for description below, but the present invention is not limited to PUCCH, and can also be applied to any other uplink signal transmission.

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

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

Therefore, when there is a user equipment that sends an uplink control signal on the same time-frequency resource within the coverage of the coordination node, such as UE2 in FIG. The node RRH1 demodulates the PUCCH signal of the CoMP UE1, and the gain of multi-point reception under UL CoMP is very small.

In the existing LTE Rel-8/9/10 standard, PUCCH format 1/1a/1b is used for HARQ-ACK bit transmission. FIG. 3 is a schematic diagram of a PUCCH format 1/la/lb frame structure with a conventional cyclic prefix (CP, cyclic prefix). As shown in FIG. 3, a pilot signal (DMRS , demodulation reference signal ) occupies the middle three SC-FDMA signals, and the PUCCH data area occupies 4 symbols.

Table 1 shows the PUCCH format 1/la/lb intra-cell and inter-cell interference cancellation methods, as shown in Table 1: The resource of PUCCH format 1/la/lb is controlled by the Physical Downlink Control Channel (PDCCH, Physical Downlink Control Channel) The lowest CCE sequence number _nCCE indicated is jointly determined by N^ _OT indicated by high-layer signaling, that is, the resource sequence number allocated to the user for transmitting PUCCH format 1/la/lb is _{wH eH} = _{nCCE +} N _CCH .

Among them, the PUCCH format 1/1a/1b used for HARQ-ACK transmission in the next cell of the conventional CP passes 6 cyclic shifts (CS, cyclic shift) in the frequency domain and 3 orthogonal sequences (orthogonal shift) with a time length of 4. sequences) can support simultaneous co-frequency resource transmission of 18 PUCCH formats 1/1a/1b on 1 RB, and at the same time, through CS hopping between cell-specific SC-FDMA symbols (Cell-specific CS hopping over SC- FDMA symbol) achieves interference randomization between cells. Table 1

PUCCH format Resource indication Intra-cell interference cancellation Inter-cell interference randomization

( Resource index)

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

CS hopping between 3 orthogonal sequences of length 4

columns; quadrature for 18 UEs FIG. 4 shows a schematic diagram of mutual orthogonality of PUCCH formats 1/1a/1b between users in a cell. As shown in FIG. 4, two users who have the same cell ID in a cell and are scheduled to the same time-frequency resource When sending PUCCH format 1/la/lb, the same base sequence is used, and in the case that two users use the same cyclic shift, different orthogonal codes (OCC, Orthogonal Cover Code) can be used to make the PUCCH format 1 of UE1 and UE2 /la/lb are multiplexed in CDM and orthogonal.

For heterogeneous networks with different cell identities, it is still possible to design orthogonal PUCCH sequences (including data area and DMRS area) between CoMP UEs and coordinating node users to eliminate interference to CoMP UEs from coordinating node coverage users, thereby improving uplink Performance of receiving PUCCH signals at multiple points in a CoMP scenario.

Example 1

An embodiment of the present invention provides an uplink signal transmission method in a coordinated multi-point system, wherein the coordinated multi-point system includes a serving node and a coordinating node with different cell identities, and user equipment served by the serving node and the coordinating 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:

In step 501, the user equipment transmits an uplink signal to the serving node and the coordinating node, wherein the uplink signal transmitted by the user equipment is orthogonal to the uplink signals transmitted by other user equipment served by the coordinating node.

Wherein, the serving node may be a macro cell base station, the coordinating node may be an RRH, and the serving node and the coordinating node have different cell identities. But not limited thereto, for example, both the serving node and the coordinating node can be macro cell base stations, and jointly serve the user equipment. The specific composition of the coordinated multi-point system can be determined according to the actual situation.

In an embodiment, a code division multiplexing (CDM, Code Division Multiplexing) manner may be used to realize the orthogonality between the CoMP UE and the UE served by the coordination node. The CoMP UE and the UE served by the coordinating node are scheduled to use the same time-frequency resource.

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

Step 601, process the cyclic shift of the user equipment, so that the used The difference between the hopping value of the cyclic shift of the user equipment and the hopping value of the cyclic shift of other user equipment served by the coordination node remains unchanged;

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

The following uses an example where the user equipment is UE1 shown in FIG. 2 and the other user equipment served by the coordination node is UE2 shown in FIG. 2 as an example. As shown in Figure 2, the PUCCH signal sent by UE1 is received by the macro eNB and RRH1, and UE2 belongs to the single-point service user covered by RRH1.

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

Among them, 4 is the complex-valued modulation symbol modulated by BPSK/QPSK by 1-bit or 2-bit ACK/NACK information transmitted by UE1 on PUCCH format 1/1a/1b; S is the scrambling signal of UE1 on slot#0 ; is the cell-specific ^base sequence generated by the Zad-off Chu sequence, the sequence length on one RB is N _S ^CT =12, and the base sequence remains unchanged on one slot; N _{sp F} ^ueeH =4 indicates the conventional PUCCH format 1/la/lb is the number of SC-FDMA symbols occupied by each time slot in a subframe. And, A ,/) is the cyclic shift CS value of the UE1 PUCCH base sequence, which hops on SC-FDMA on each slot, is the slot number, / is the SC-FDMA symbol number, for PUCCH format 1 /la/lb data transmission, in one time slot, the corresponding SC-FDMA symbol sequence number is Z = {0,1,2,6}; w _x = { _Wl (m) I m = 0,1,... , N _S ^P _F ^UCCH -1} i An orthogonal sequence of length A ^∞H used by UE1 to transmit PUCCH data symbols on slot#0. Similarly, a similar expression for sending the PUCCH data signal by UE2 may 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:

ΨΧ ^-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, formula (3) can be transformed into ^ψ = (") +∑ (12 + ")¾*(l ² + ") +∑ ( ²⁴ + ")¾*( ²⁴ + ") +∑ (36 + w) _¾ *(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 {α ₂₁ ,α ₂₂ ,α ₂₃ ,α ₂₄ } represent the motifs used by UE1 and UE2. In PUCCH format 1/la/ The CS jump value on the 4 SC-FDMA in the data area of lb.

In this embodiment, when step 601 is implemented, the cyclic shift of the user equipment may be processed, so that the jump value of the cyclic shift of the user equipment on each symbol is different from that of other user equipment served by the coordinated node. The difference between the jump values of the cyclic shift remains unchanged.

Taking UE1 and UE2 above as examples, that is: _u — a ₂₁ = a ₁₂ - ₂₂ = a ₁₃ - ₂₃ = a ₁₄ - ₂₄ = Aa Therefore, formula (4) can be further expressed as: , because

UE1 and UE2 adopt different orthogonal sequences, that is, and ^ ₂ are orthogonal to each other, so two ^^) ¹ !^^^^" ¹ ^^)^^ ^. Therefore, the orthogonality of UE1 and UE2 can finally be realized .

In one embodiment, step 601 may specifically include: turning off the cyclic shift, stopping the user equipment, and switching the cyclic shift of other user equipment that is scheduled to the same time-frequency resource as the user equipment served by the coordination node . That is, for the user equipment, an instruction to stop the cyclic shift hopping of the user equipment sent by the serving node may be received; according to the instruction, the cyclic shift hopping of the user equipment is disabled.

Specifically, the CS hopping of each user equipment can be disabled, that is, UE-specific CS hopping disabling, it is the same, a = a ₁₂ = a ₁₃ = a _u , a ₂₁ = a ₂₂ = a ₂₃ = a ₂₄ , thus

= Aa.

In a specific implementation, the serving node may send an indication of disabling CS hopping to the user equipment (for example, UE1), which may be indicated through high-level signaling. After receiving the indication, the user equipment closes its CS hopping function for sending PUCCH format 1/la/lb. At the same time, the service node sends an instruction to close the CS hopping to the coordination node through the backhaul interaction mode such as optical fiber connection/X2 interface, and after receiving the instruction, the coordination node schedules the same time-frequency resource user as UE1 to serve The device (such as UE2) sends an indication of disabling CS hopping, which may be indicated through high-layer signaling. After receiving the indication, the user equipment in the coordinated cell closes the CS hopping function of the PUCCH format 1/1a/1b sent by it. But it is not limited to this, and the specific implementation manner can be determined according to the actual situation.

In another embodiment, step 601 may specifically include: the user equipment receiving the cell identity of the coordinating node sent by the serving node; performing a cycle related to the cell identity of the coordinating node on each symbol according to the received cell identity of the coordinating node Shift jumps.

In specific implementation, still taking the above UE1 and UE2 as an example, the serving node macro eNB where the CoMP UE1 is located can inform the CoMP UE1 of the cell ID of the coordinating node RRH1 in a dynamic or semi-static manner. Therefore, the CoMP UE1 can perform user-specific CS hopping, that is, UE-specific CS hopping. According to Rel-8/9/10, the cell-specific CS hopping of users in each cell is achieved by the following formula:

(" _s ,/)+ ";(" _s ) AST + (n^ (n _s ) mod ) mod N' modN , conventional CP n (n ) + [n'M- - A™ ^H + nJ( ) (n _s )/2 ) mod N' modN , extended CP

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

In this embodiment, after CoMP UE1 obtains the cell identity (RRH1_ID) of RRH1, it does not perform macro eNB cell identity-specific CS hopping, and its hopping value depends on the cell identity of RRH1, so that the user-specific CS hopping, so that the CS hopping of UE1 on the SC-FDMA symbol depends on the U( , ¾+8+')-2' (where c _init = NRRHi ro ).

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

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

Therefore, through CoMPUE1-specific CS hopping, 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 above embodiments that, for the code division multiplexing mode, by processing the cyclic shift of the user equipment, the jump value of the cyclic shift of the user equipment on each symbol is different from that of other user equipment served by the coordinated node The difference between the hopping value of the cyclic shift remains unchanged; at the same time, the two users use different orthogonal codes, so as to ensure the orthogonality of uplink signal transmission and further reduce the interference of user equipment in adjacent cells.

In another embodiment, a frequency division multiplexing (FDM, Frequency Division Multiplexing) manner may be used to realize the orthogonality between the CoMP UE and the UE served by the coordination node.

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

Step 701, the user equipment transmits the uplink signal according to the resource sequence number sent by the serving node for indicating the resource block used by the user equipment for uplink signal transmission; wherein, the resource block indicated by the resource sequence number is different from that allocated by the coordination node to other users The resource block for the device.

In this embodiment, still taking the scenario shown in FIG. 2 as an example, by interacting backhaul signaling (such as through optical fiber connection or X2 interface) between the primary cell macro eNB constituting the CoMP cell and the coordination node RRH1, CoMP UE1 can Different PUCCH resource blocks are allocated to user equipment in neighboring cells, so as to realize the orthogonality of the FDM mode.

As shown in FIG. 7, before transmitting the uplink signal, the uplink transmission method may further include: Step 702, the user equipment receives the resource sequence number sent by the serving node for indicating the resource block used by the user equipment for uplink signal transmission.

It can be known from the above embodiments that, for the frequency division multiplexing mode, by allocating different resource blocks to the CoMP user equipment and the user equipment served by the coordination node; the orthogonality of the uplink control channel transmission can be ensured, thereby further reducing the adjacent Interference from user equipment in the cell.

Example 2

An embodiment of the present invention provides an uplink signal transmission method in a coordinated multi-point system, wherein the coordinated multi-point system includes a serving node and a coordinating node with different cell identities, and user equipment served by the serving node and the coordinating node. The uplink signal transmission method will be described below from the base station side.

Fig. 8 is another flow chart of the uplink signal transmission method according to the 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 the uplink signal transmitted by the user equipment, wherein the uplink signal transmitted by the user equipment is kept orthogonal to the uplink signal transmitted by other user equipment served by the coordination node.

In one embodiment, the CDM method may be adopted to realize the orthogonality between the CoMP UE and the UE served by the coordination node. The CoMP UE and the UE served by the coordinating node are scheduled degree to use the same time-frequency resources.

In this embodiment, the uplink signal transmitted by the user equipment is sent according to the processed cyclic shift and an orthogonal sequence different from that of other user equipment; wherein the jump value of the processed cyclic shift on each symbol, The difference between the jump value of the cyclic shift and that of other user equipments served by the coordinating node remains unchanged.

In one embodiment, before step 801, the uplink signal transmission method may further include: disabling CS hopping of each user equipment. That is, the serving node may send an instruction to stop cyclic shift hopping to the coordinating node and the user equipment, so as to close the cyclic shifting of the user equipment and other user equipment served by the coordinating node that occupy the same time-frequency resource as the user equipment In another embodiment, before step 801, the uplink signal transmission method may further include: the serving node sends the cell identity of the coordination node to the user equipment, so that the user equipment performs cyclic shift hopping according to the cell identity of the coordination node.

It can be seen from the above embodiments that, for the code division multiplexing mode, by processing the cyclic shift of the user equipment, the jump value of the cyclic shift of the user equipment on each symbol is different from that of other user equipment served by the coordinated node The difference between the hopping value of the cyclic shift remains unchanged; at the same time, the two user equipments use different orthogonal codes, so that the orthogonality of uplink transmission signals can be ensured, and the interference of user equipments in adjacent cells can be further reduced.

In another embodiment, the FDM method may be used to realize the orthogonality between the CoMP UE and the UE served by the coordination node.

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

Step 901, the serving node sends the resource sequence number used to indicate the resource block used by the user equipment for uplink signal transmission to the user equipment, so that the user equipment performs uplink signal transmission on the resource block indicated according to the resource sequence number; wherein, The resource block indicated by the resource sequence number is different from the resource block allocated by the coordination node to other user equipments.

In this embodiment, still taking the scenario shown in FIG. 2 as an example, by interacting backhaul signaling (such as through optical fiber connection or X2 interface) between the primary cell macro eNB constituting the CoMP cell and the coordination node RRH1, CoMP UE1 can Different PUCCH resource blocks are allocated to user equipment in neighboring cells, so as to realize the orthogonality of the FDM mode. FIG. 10 is a schematic diagram of implementing physical resource orthogonality in an FDM manner according to an embodiment of the present invention. As shown in Figure 10, different PUCCH resource blocks can be allocated to CoMP user equipment and adjacent cell user equipment.

In one embodiment, before step 901, the uplink signal transmission method may further include: the serving node sends the resource sequence number used to indicate the resource block used by the user equipment for uplink signal transmission to the coordinating node, so that the coordinating node allocates When using resources, avoid allocating the resource block indicated by the resource sequence number to the user served by its own cell.

In specific implementation, similar to PUCCH format 2/2a/2b and PUCCH format 3, the CoMP UE1 PUCCH format 1/1a/1b transmission resource is used to inform the user through high-level signaling, and the serving node macro eNB where the CoMP UE1 is located will CoMP The _ieeH used by UE1 tells CoMP UE's coordinating node RRH1 through backhaul (such as optical fiber connection or X2 interface), and when RRH1 schedules the PUCCH resources of UEs (such as UE2) in its own cell, it is separated from CoMP UE1 on the RB resource block .

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

In specific implementation, for example, a set of resources { CCH4 C - ^ _Η , Λ ^ can be assigned to CoMP UE1 in a semi-static manner, and the resource information of this set can be told to the coordination node of CoMP UE1 through backhau (such as optical fiber connection or X2 interface) RRH1, when RRH1 schedules the PUCCH resource of the user equipment (such as UE2) in its own cell, separates it from the physical resource and the CoMP UE1.

It can be known from the above embodiments that, for the frequency division multiplexing mode, by allocating different resource blocks to the CoMP user equipment and the user equipment served by the coordination node; the orthogonality of the uplink control channel transmission can be ensured, thereby further reducing the adjacent Interference from user equipment in the cell.

Example 3

An embodiment of the present invention provides a user equipment, which is applied in a coordinated multi-point system, where the coordinated multi-point system further includes a serving node and a coordinating node with different cell identities. The same content as the method in the above-mentioned embodiment 1 will not be repeated here. FIG. 11 is a schematic 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. Wherein, the uplink signal transmission unit 1101 transmits the uplink signal to the serving node and the coordinating node, wherein the uplink signal is kept orthogonal to the uplink signal transmitted by other user equipment served by the coordinating node.

In one embodiment, the CDM method may be adopted to realize the orthogonality between the CoMP UE and the UE served by the coordination node. The CoMP UE and the UE served by the coordinating node are scheduled to use the same time-frequency resource.

FIG. 12 is another schematic structural diagram of user equipment according to an 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.

Wherein, the cyclic shift processing unit 1201 processes the cyclic shift of the user equipment, so that on each symbol, the jump value of the cyclic shift of the user equipment and the cyclic shift of other user equipment served by the coordinated node The difference between the jump values remains unchanged; the uplink signal transmission unit 1202 transmits the 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 one embodiment, the cyclic shift processing unit 1201 may specifically include: a closing instruction receiving unit, which receives an instruction sent by the serving node to stop the cyclic shift transition of the user equipment; a cyclic shift closing unit, which closes the cyclic shift according to the instruction The hopping of the cyclic shift of the user equipment.

During specific implementation, the cyclic shift closing unit may close its own CS hopping function after receiving the instruction to close the CS hopping sent by the serving node. And other user equipment (such as UE2) may also close its own CS hopping function after receiving the instruction to close the CS hopping sent by the coordination node (such as RRH1).

In another embodiment, the cyclic shift processing unit 1201 may specifically include: a cell identity receiving unit, which receives the cell identity of the coordination node sent by the serving node; and a cyclic shift jumping unit, which receives the cell identity of the coordination node according to Mark, and perform cyclic shift jumps on each symbol.

It can be seen from the above embodiments that, for the code division multiplexing mode, by processing the cyclic shift of the user equipment, the jump value of the cyclic shift of the user equipment on each symbol is different from that of other user equipment served by the coordinated node The difference between the hopping value of the cyclic shift remains unchanged; at the same time, the two user equipments use different orthogonal codes, so that the orthogonality of uplink transmission signals can be ensured, and the interference of user equipments in adjacent cells can be further reduced. In another embodiment, the FDM method may be used to realize the orthogonality between the CoMP UE and the UE served by the coordination node. The uplink signal transmission unit 1101 may specifically include: performing uplink signal transmission according to the resource sequence number sent by the serving node for indicating the resource block used by the user equipment for uplink signal transmission; wherein, the resource block indicated by the resource sequence number is different from the Resource blocks allocated to other user equipment.

In specific implementation, the user equipment may further include: a resource sequence number receiving unit, which receives the resource sequence number sent by the serving node and used to indicate the resource block used by the user equipment for uplink signal transmission.

It can be known from the above embodiments that, for the frequency division multiplexing mode, by allocating different resource blocks to the CoMP user equipment and the user equipment served by the coordination node; the orthogonality of the uplink control channel transmission can be ensured, thereby further reducing the adjacent Interference from user equipment in the cell.

Example 4

An embodiment of the present invention also provides a base station, which is applied in a coordinated multi-point system, where the coordinated multi-point system further includes a coordinating node with a cell identity different from that of the serving node, and user equipment served by the base station and the coordinating node . The same content as the method in the above-mentioned embodiment 2 will not be repeated here.

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. Wherein, the uplink signal receiving unit 1301 receives the uplink signal transmitted by the user equipment, wherein the uplink signal transmitted by the user equipment is kept orthogonal to the uplink signal transmitted by other user equipment served by the coordination node.

In one embodiment, the CDM method may be adopted to realize the orthogonality between the CoMP UE and the UE served by the coordination node. The CoMP UE and the UE served by the coordinating node are scheduled to use the same time-frequency resource.

Wherein, 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 jump value of the processed cyclic shift and other user equipment served by the coordinated node The difference between the jump values of the cyclic shift remains unchanged.

In an embodiment, the base station may further include: a closing instruction sending unit, which sends an instruction to stop cyclic shift jumping to the coordination node and the user equipment, so as to turn off the cyclic shift switching of the user equipment and other user equipment. Jump.

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

It can be known from the above embodiments that, for the code division multiplexing mode, by processing the cyclic shift of the user equipment, the jump value of the cyclic shift of the user equipment on each symbol is different from that of other user equipment served by the coordinated node The difference between the hopping values of the cyclic shift remains unchanged; the orthogonality of uplink transmission signals can be guaranteed, thereby further reducing the interference of user equipment in adjacent cells.

In another embodiment, the FDM method may be used to realize the orthogonality between the CoMP UE and the UE served by the coordination node.

FIG. 14 is another schematic structural diagram 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 sending unit 1402.

Wherein, the resource sequence number sending unit 1402 sends the resource sequence number used to indicate the resource block used by the user equipment to transmit the uplink control channel to the user equipment, so that the user equipment performs the transmission of the uplink control channel 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, where the uplink signal is transmitted on the resource block indicated by the resource sequence number. Wherein, the resource block indicated by the resource sequence number is different from the resource block allocated by the coordination node to other user equipments.

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

In another embodiment, the base station may further include: a second sending unit, which sends the resource set including the resource sequence number used to indicate the resource block used by the user equipment for uplink signal transmission to the coordinating node, so that the coordinating node allocates Avoid allocating the resource block indicated by the resource sequence number.

It can be seen from the above embodiments that, for the frequency division multiplexing mode, by allocating different resource blocks to the CoMP user equipment and the adjacent cell user equipment; the orthogonality of the uplink control channel transmission can be ensured, thereby further reducing the adjacent cell user equipment. interference.

An embodiment of the present invention also provides a computer-readable program, wherein when the program is executed in the base station, the program causes the computer to execute the above-mentioned uplink signal transmission method in the base station.

An embodiment of the present invention also provides a storage medium storing a computer-readable program, wherein The computer-readable program enables the computer to execute the above-mentioned uplink signal transmission method in the base station.

An embodiment of the present invention also provides a computer-readable program, wherein when the program is executed in the user equipment, the program causes the computer to execute the above-mentioned uplink signal transmission method in the user equipment.

An embodiment of the present invention also provides a storage medium storing a computer-readable program, wherein the computer-readable program enables the computer to execute the above-mentioned uplink signal transmission method in the user equipment.

The above devices and methods of the present invention can be implemented by hardware, or by a combination of hardware and software. The present invention relates to such a computer-readable program, when the program is executed by a logic component, it can make the logic component realize the above-mentioned device or constituent component, or make the logic component realize the above-mentioned various methods or steps. The present invention also relates to storage media for storing the above programs, such as hard disks, magnetic disks, optical disks, DVDs, flash memories, and the like.

One or more of the functional blocks described in the drawings and/or one or more combinations of the functional blocks can be implemented as a general-purpose processor, a digital signal processor (DSP) for performing the functions described in this application ), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof. One or more of the functional blocks described in the drawings and/or one or more combinations of the functional blocks may also be implemented as a combination of computing devices, for example, a combination of DSP and a microprocessor, a plurality of microprocessors processor, one or more microprocessors in communication with a DSP, or any other such configuration.

The present invention has been described above in conjunction with specific embodiments, but those skilled in the art should be clear that these descriptions are exemplary and not intended to limit the protection scope of the present invention. Those skilled in the art can make various variations and modifications to the present invention according to the spirit and principle of the present invention, and these variations and modifications are also within the scope of the present invention.

Claims (1)

1. Claims

   1st, the uplink signal transmission method in a kind of Synergistic multi-point system, wherein the Synergistic multi-point system includes the service node and cooperative node identified with different districts and the user equipment serviced by the service node and cooperative node；The uplink signal transmission method includes：

   The user equipment transmits upward signal to the service node and cooperative node, wherein the upward signal holding of other users equipment transmission of the upward signal of the user device transmissions with being serviced by the cooperative node is orthogonal.

   2nd, uplink signal transmission method according to claim 1, wherein, before the user equipment transmits upward signal to the service node and cooperative node, the uplink signal transmission method also includes：

   Cyclic shift to the user equipment is handled so that the difference of the hop value of the cyclic shift of the hop value of the cyclic shift of the user equipment and the other users equipment serviced by the cooperative node is constant on each symbol；

   Also, the user equipment is according to the cyclic shift after processing and the orthogonal sequence different from the other users equipment, upward signal is transmitted to the service node and cooperative node.

   3rd, uplink signal transmission method according to claim 2, wherein, the cyclic shift progress processing to the user equipment is specifically included：

   Receive the saltus step of the cyclic shift for the stopping user equipment that the service node is sent finger closed according to the instruction user equipment cyclic shift saltus step.

   4th, uplink signal transmission method according to claim 2, wherein, the cyclic shift progress processing to the user equipment is specifically included：

   Receive the cell ID for the cooperative node that the service node is sent；

   According to the cell ID of the cooperative node received, circulation shifting is carried out on each symbol

   , 5 uplink signal transmission methods according to claim 1, wherein, the user equipment to the service node and cooperative node transmission upward signal specifically include：

   The transmission for being used for the resource sequence number for indicating that the user equipment carries out uplink signal transmissions used resource block, carrying out upward signal that the user equipment is sent according to the service node； Wherein, the resource block that the resource sequence number is indicated is different from the resource block that the other users equipment is distributed to by the cooperative node.

   6th, uplink signal transmission method according to claim 5, wherein, before transmission upward signal, the ascending transmission method also includes：

   The user equipment receives the resource sequence number for being used to indicate the user equipment progress uplink signal transmissions used resource block that the service node is sent.

   7th, the uplink signal transmission method in a kind of Synergistic multi-point system, wherein the Synergistic multi-point system includes the service node and cooperative node identified with different districts and the user equipment serviced by the service node and cooperative node；The uplink signal transmission method includes：

   The service node receives the upward signal of the user device transmissions, wherein the upward signal holding of other users equipment transmission of the upward signal of the user device transmissions with being serviced by the cooperative node is orthogonal.

   8th, uplink signal transmission method according to claim 7, wherein, the upward signal of the user device transmissions be according to the cyclic shift after processing and the orthogonal sequence different from the other users equipment and send；

   Wherein, the difference of the hop value of the cyclic shift of the hop value of the cyclic shift on each symbol after the processing and the other users equipment is constant.

   9th, uplink signal transmission method according to claim 8, wherein, the uplink signal transmission method also includes：

   The service node sends the instruction for the saltus step for stopping cyclic shift to the cooperative node and the user equipment, to close the cyclic shift of the user equipment and the other users equipment

   , 10, uplink signal transmission method according to claim 8, wherein, the uplink signal transmission method also includes：

   The service node sends the cell ID of the cooperative node to the user equipment so that the user equipment carries out the saltus step of cyclic shift according to the cell ID of the cooperative node.

   11st, uplink signal transmission method according to claim 7, wherein, before the upward signal of the user device transmissions is received, the ascending transmission method also includes：

   The service node is by for indicating that the resource sequence number of the user equipment progress uplink signal transmissions used resource block is sent to the user equipment so that the user equipment is according to the resource The transmission of upward signal is carried out on resource block indicated by sequence number；

   Wherein, the resource block that the resource sequence number is indicated is different from the resource block that the other users equipment is distributed to by the cooperative node.

   12nd, uplink signal transmission method according to claim 11, wherein, the uplink signal transmission method also includes：

   The service node is by for indicating that the resource sequence number of the user equipment progress uplink signal transmissions used resource block is sent to the cooperative node so that the cooperative node avoids distributing the resource block indicated by the resource sequence number when distributing resource.

   13rd, uplink signal transmission method according to claim 11, wherein, the uplink signal transmission method also includes：

   The service node sends the resource set comprising the resource sequence number for indicating the user equipment progress uplink signal transmissions used resource block to the cooperative node so that the cooperative node avoids distributing the resource block indicated by the resource sequence number when distributing resource.

   14th, a kind of user equipment, applied in Synergistic multi-point system, wherein the Synergistic multi-point system also includes the service node and cooperative node identified with different districts；The user equipment includes:Uplink signal transmissions unit, it transmits upward signal to the service node and cooperative node, wherein the upward signal holding of other users equipment transmission of the upward signal with being serviced by the cooperative node is orthogonal.

   15th, user equipment according to claim 14, wherein, the user equipment also includes：Cyclic shift processing unit, its cyclic shift to the user equipment is handled so that the difference of the hop value of the cyclic shift of the hop value of the cyclic shift of the user equipment and the other users equipment of cooperative node service is constant on each symbol；

   Also, the uplink signal transmissions unit is according to the cyclic shift after processing and the orthogonal sequence different from the other users equipment, upward signal is transmitted to the service node and cooperative node.

   16th, user equipment according to claim 15, wherein, the cyclic shift processing unit is specifically included：

   Out code receiving unit, it receives the instruction of the saltus step of the cyclic shift for the stopping user equipment that the service node is sent；

   Cyclic shift closing unit, the cyclic shift of the user equipment is closed according to the instruction 17th, user equipment according to claim 15, wherein, the cyclic shift processing unit is specifically included：

   Cell ID receiving unit, it receives the cell ID for the cooperative node that the service node is sent；

   Cyclic shift saltus step unit, it carries out the saltus step of cyclic shift according to the cell ID of the cooperative node received on each symbol.

   18th, user equipment according to claim 14, wherein, the uplink signal transmissions unit is specifically included：The transmission for being used for the resource sequence number for indicating that the user equipment carries out uplink signal transmissions used resource block, carrying out upward signal sent according to the service node；

   Wherein, the resource block that the resource sequence number is indicated is different from the resource block that the other users equipment is distributed to by the cooperative node.

   19th, user equipment according to claim 18, wherein, the user equipment also includes：Resource sequence number receiving unit, it receives the resource sequence number for being used to indicate the user equipment progress uplink signal transmissions used resource block that the service node is sent.

   20th, a kind of base station, applied in Synergistic multi-point system, wherein the Synergistic multi-point system also includes the cooperative node with the cell ID different from the base station and the user equipment serviced by the base station and cooperative node；The base station includes：

   Upward signal receiving unit, it receives the upward signal of the user device transmissions, wherein the upward signal holding of other users equipment transmission of the upward signal of the user device transmissions with being serviced by the cooperative node is orthogonal.

   21st, base station according to claim 20, wherein, the base station also includes：Out code transmitting element, it sends the instruction for the saltus step for stopping cyclic shift to the cooperative node and the user equipment, with the saltus step for the cyclic shift for closing the user equipment and the other users equipment.

   22nd, base station according to claim 20, wherein, the base station also includes：Cell ID transmitting element, it sends the cell ID of the cooperative node to the user equipment so that the user equipment carries out the saltus step of cyclic shift according to the cell ID of the cooperative node.

   23rd, base station according to claim 20, wherein, the base station also includes： Resource sequence number transmitting element, it is by for indicating that the resource sequence number of the user equipment progress uplink signal transmissions used resource block is sent to the user equipment so that the user equipment carries out the transmission of upward signal on the resource block according to indicated by the resource sequence number；

   Wherein, the resource block that the resource sequence number is indicated is different from the resource block that the other users equipment is distributed to by the cooperative node.

   24th, base station according to claim 23, wherein, the base station also includes：First transmitting element, it is by for indicating that the resource sequence number of the user equipment progress uplink signal transmissions used resource block is sent to the cooperative node so that the cooperative node avoids distributing the resource block indicated by the resource sequence number when distributing resource.

   25th, base station according to claim 23, wherein, the base station also includes：Second transmitting element, it sends the resource set comprising the resource sequence number for indicating the user equipment progress uplink signal transmissions used resource block to the cooperative node so that the cooperative node avoids distributing the resource block indicated by the resource sequence number when distributing resource.

   26th, a kind of computer-readable program, wherein when performing described program in a user device, described program causes computer to perform the uplink signal transmission method as described in any one of claim 1 to 6 in the user equipment.

   27th, a kind of storage medium for the computer-readable program that is stored with, wherein the computer-readable program causes computer to perform the uplink signal transmission method as described in any one of claim 1 to 6 in a user device.

   28th, a kind of computer-readable program, wherein when performing described program in a base station, described program causes computer to perform the uplink signal transmission method as described in any one of claim 7 to 13 in the base station.

   29th, a kind of storage medium for the computer-readable program that is stored with, wherein the computer-readable program causes computer to perform the uplink signal transmission method as described in any one of claim 7 to 13 in a base station.