WO2009070930A1

WO2009070930A1 - System and method for implementing uplink transmission by borrowing or sharing spectrums and channel resources of neighbor cells

Info

Publication number: WO2009070930A1
Application number: PCT/CN2007/003453
Authority: WO
Inventors: Xinxi Diao
Original assignee: Zte Corporation
Priority date: 2007-12-05
Filing date: 2007-12-05
Publication date: 2009-06-11
Also published as: CN101803419A; CN101803419B

Abstract

A system and a method for implementing uplink transmission by borrowing or sharing the spectrum and channel resources of the neighbor cells are provided in the present invention. In the above system, one or more terminals located in the edge area of the serving cell share a set of spectrum resources with one or more terminals located in the edge area of the cells neighboring to the serving cell, wherein the set of spectrum resources are allocated to the edge area of the cells by the serving cell and the cells neighboring to the serving cell in a soft frequency multiplexing mode. With the invention, the inter-cell diversity receiving gain could be further achieved, and the area enabling the use of the spectrums of the several neighbor cells could be increased, therefore, the uplink transmission rate and the spectrum efficiency of the terminal within the edge area of the cell could be increased in a larger area.

Description

Borrow or share the spectrum of neighboring cells and channel resources

TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to an uplink transmission system and method for borrowing or sharing a neighboring cell spectrum resource and a channel resource, which uses a spectrum resource and a channel resource receiving terminal of a neighboring cell that is borrowed or shared. The uplink service data sent. BACKGROUND The core problem of Inter-cell Interference Coordination (ICIC) is to coordinate the use of radio resources among multiple cells, and in particular, the cell border requires special attention. . The ICIC coordinates spatial, temporal, and frequency channel resources and power among multiple cells, thereby reducing interference between adjacent cells. Interference coordination techniques in the time-frequency domain can be divided into static, semi-static and dynamic modes of time-frequency domain resource coordination. The static mode is mainly determined by inter-cell planning when performing cell planning. The coordination of resources can be modified according to changes in load and service characteristics between cells, but the time period of such changes is generally longer. For semi-static methods, the period of resource allocation is higher than the static mode. For dynamic coordination, resource allocation is performed at a high frequency. The dynamic mode can obtain the highest gain, but the required measurement and information reporting overhead is very large, and frequent real-time communication between multiple cells is required. One basic solution to inter-cell interference is "soft frequency reuse" or "partial frequency reuse." The sub-carriers of the OFDM (Orthogonal Frequency Division Multiple Access) system are divided into m groups, and different neighboring cells select different subcarriers as the primary subcarrier of the current cell, and other subcarriers serve as the primary carrier. The secondary subcarrier of the cell sets different transmit power thresholds for the primary and secondary subcarriers of each cell, and the transmit power threshold of the primary subcarrier is higher than the transmit power threshold of the secondary subcarrier, and the cell is determined by the coverage of the primary subcarrier. boundary. The primary subcarrier is allocated from the center of the cell to the cell edge, which can cover the entire cell range; the blank area is allocated a secondary subcarrier, which covers only the interior of the cell. In this way, for the intra-cell, the lower-power sub-subcarrier is mainly used to transmit data. Because the base station is relatively close to the base station, the terminal can receive the clear signal of the local cell, and because the sub-subcarrier power is small, the adjacent cells are The interference is also relatively small; and the high-power primary carrier transmits data in the edge region of each neighboring cell, which is in the edge region. The terminal mainly receives the primary subcarriers of different neighboring cells. Since the primary subcarriers of different neighboring cells do not overlap and are orthogonal, the mutual protection is greatly reduced. A patented technology related to "soft frequency reuse" or "partial frequency reuse" has a Chinese patent application entitled "Method for Coordinating Inter-Cell Interference Through Power Planning for OFDM Mobile Communication Systems", entitled "Single Frequency" The Chinese patent application No. CN200610087983 of the method of the uplink 4 in the network, the base station, the terminal and the network. This method is being discussed in the long-term evolution system standard for the third generation of mobile communications before I). The drawback of this technique is that the frequency resources at the edge of the cell are limited, and it is difficult to support a large number of users and a high data rate. In order to alleviate the problem that the frequency resources of the cell edge existing in the "soft frequency reuse" are limited, a basic idea is to improve the frequency reuse coefficient of the cell edge, that is, to break the fixed monthly coefficient of the edge region, such as 1/3. limit. Technical Proposal: One idea given by 3GPP R1-051059 (Inter-cell interference mitigation for EUTRA. Texas Instruments, 3 GPP RAN WG1 #42bis, San Diego, California, US, October 2005) is: When the load of the neighboring cell is lighter When the frequency of the neighboring cell is borrowed to increase the transmission rate of the edge terminal of the cell, FIG. 1 shows a schematic diagram of the method. In the R1-051059 scheme, all frequency bands are used for power reduction within the cell, but the cell edge is no longer fixed 1/3, but is adjusted according to the edge load between adjacent cells. When there are fewer users at a certain cell edge, the available frequency will be less than 1/3. At the same time, when the edge of the neighboring cell is heavier, the available frequency of the edge of the neighboring cell will exceed 1/3. If all cell edge users are heavily loaded, the available frequencies at the edge of each cell are 1/3. Referring to Figure 1, the method of frequency soft multiplexing used by the inter-cell edge given by the R1-051059 scheme is as follows: It is assumed that at the first moment, the edge load of the cell 1 is heavier, and the edges of the neighboring cells 2, 4, and 6 are The load is lighter, and the edge load of the 3, 5, and 7 cells is general. At this time, the 3, 5, and 7 cell edges still occupy 1/3 of the frequency band, and the 2, 4, and 6 cells save a part of the frequency to the edge of the cell 1. The user uses, at this time, the edge user of the cell 1 occupies more than 1/3 of the frequency band. Assume that at the Mth moment, the edge load of cell 1 is general, and the edge load of the neighboring cells 2, 4, and 6 is heavier, and the edge load of the cells of 3, 5, and 7 is relatively light, according to the scheme, One cell edge allocates the original 1/3 available frequency band, while the 3, 5, and 7 cells save a part of the frequency for the 2, 4, and 6 cell edge users. At this time, the available frequencies of the 2, 4, and 6 cell edge users exceed The original 1/3 available frequency. However, the above method cannot completely solve the problem that the frequency resources of the cell edge existing in the soft frequency multiplexing technology are limited. Therefore, a new technical solution is needed. SUMMARY OF THE INVENTION The present invention has been made in view of the problem that a spectrum bandwidth that can be used by a terminal located in a cell edge region in a soft frequency multiplexing (or fractional frequency reuse) in the related art is narrow, and the present invention is An uplink transmission technology for borrowing or sharing spectrum resources and channel resources of a neighboring cell is provided. According to an aspect of the present invention, an uplink transmission system that borrows or shares neighboring cell spectrum resources and channel resources is provided. The system includes a plurality of adjacent or adjacent wireless nodes and at least one terminal, and the area covered by each wireless node is a cell, and the cell where the terminal is located is a serving cell. The one or more terminals located in the edge area of the serving cell and the one or more terminals in the edge area of the neighboring cell of the serving cell share the serving cell and the neighboring cell of the serving cell are allocated to the edge of the cell in a soft frequency reuse manner. Regional spectrum resources. In the foregoing system, the terminal shares a set of spectrum resources in various manners, for example: (1) terminals belonging to different cells share a set of spectrum resources in a time division manner; wherein, the terminal simultaneously uses an edge region belonging to the serving cell The spectrum resource and the spectrum resource belonging to the edge area of the neighboring cell send signals; (2) the terminals belonging to different cells share a set of spectrum resources by frequency hopping; wherein, the terminal of the serving cell and the neighboring cell The terminals in the edge area adopt mutually orthogonal frequency hopping patterns; (3) the terminals belonging to different cells share a set of spectrum resources in a space division manner. Further, adjacent or adjacent wireless nodes receive signals transmitted by terminals in the edge area of the serving cell and/or the neighboring cell in a spatial diversity manner. Preferably, the terminal may send the service data in the following manner: the terminal uses the resource blocks that are consecutive in the frequency domain belonging to two or more wireless nodes, and sends the service data in a single carrier manner or an orthogonal frequency division multiplexing manner; The two or more wireless nodes are selected from the wireless node of the cell where the terminal is located and the wireless node of the neighboring cell. Alternatively, the terminal may also send the service data in the following manner: The terminal uses the resource blocks that are discontinuous in the frequency domain belonging to two or more wireless nodes, and sends the service data in a single carrier manner or orthogonal frequency division multiplexing manner. Wherein two or more wireless nodes are selected from a wireless node of a cell in which the terminal is located and a wireless node of a partial cell. In addition, preferably, the foregoing wireless node includes: an independent base station, a remote radio unit of the distributed base station; and the antenna of the wireless node includes: antennas arranged at different sites, arranged in the same The antenna of the site covers the different areas; for the terminal, it includes a transmitting channel, a receiving channel, and a baseband processing unit, where the bandwidth of the transmitting channel covers both the serving cell and the neighboring cell where the terminal is located, and the transmitting channel It is possible to simultaneously transmit signals using spectrums of two or more cells. According to another aspect of the present invention, an uplink transmission method for borrowing or sharing neighboring cell resources and channel resources is provided for a system including a plurality of adjacent or neighboring wireless nodes and at least one terminal. The uplink transmission method according to the present invention includes: determining a set of preselected neighboring cell radio nodes that can participate in uplink transmission; selecting one or more working radio nodes participating in uplink transmission from a set of preselected neighboring cell radio nodes; ^! The spectrum resources of the edge area of the cell where one or more working wireless nodes can be used by the terminal and the manner of use thereof are sent to the terminal. The manner in which the terminal uses the spectrum resources of the serving cell and the edge area of the neighboring cell includes the following: (1) The terminals belonging to different cells share a set of frequency resources in a time division manner; wherein, the terminal uses the service at the same time The spectrum resource of the edge area of the cell and the spectrum resource of the edge area of the neighboring cell send a signal; (2) the terminal belonging to the different cell shares a set of spectrum resources by frequency hopping; wherein, the terminal of the edge area of the serving cell A mutually orthogonal hopping pattern is adopted between terminals of the edge area of the neighboring cell; (3) a group of spectrum resources are shared by terminals belonging to different cells in a space division manner. Preferably, the network receives the service data sent by the terminal in a macro diversity manner. Preferably, the foregoing determining the pre-selected neighboring cell radio node set is specifically: the base station sends a detection set consisting of a set of neighboring cell identification symbols to the terminal, where the probe set specifies a signal transmitted by the specific neighboring cell radio node; The measurement result of the signal specified by the detection set; the network side determines whether the signal quality of the corresponding cell reaches the threshold according to the measurement result reported by the terminal, and uses the wireless node of the cell whose signal quality reaches a wide value as the pre-selected part near cell wireless which can participate in the uplink transmission node. Preferably, the operation of selecting the multiple working wireless nodes is specifically: determining, for the neighboring cells corresponding to the pre-selected neighboring cell radio nodes, whether there is resource remaining according to the overload indication information; and acquiring resources for each neighboring cell with the remaining resources Remaining amount, and obtaining the application resource borrowing amount of the neighboring cell for it; For the neighboring cell whose remaining resource amount after the borrowing resource is removed, the wireless node is taken as the working wireless node. Preferably, the uplink transmission method according to the present invention further comprises: the network transmitting the resource location and the usage mode of the cell where the terminal is located to the terminal; and the network receiving the signal sent by the terminal in a macro diversity manner. According to the above at least one technical solution of the present invention, the diversity reception gain between the cells can be further obtained by borrowing not only the spectrum resources of the neighboring cells but also the channel resources of the neighboring cells, and the frequency space multiplexing can be maintained by combining the power control measures. When the pattern is unchanged and the neighboring cell is dry controlled, the area of the spectrum of multiple neighboring cells that the terminal can use is improved, so that the uplink transmission rate and spectrum efficiency of the terminal in the cell edge area can be improved in a larger area. Other features and advantages of the invention will be set forth in the description which follows, and The objectives and other advantages of the invention will be realized and attained by the <RTI The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the description of the invention. 1 is a schematic diagram of an inter-cell frequency borrowing method according to the related art; FIG. 2 is a schematic diagram of an uplink transmission system for borrowing or sharing frequency and channel resources of a neighboring cell according to an embodiment of the present invention; (a) is a schematic diagram of resource blocks at frequency i or above used between terminals of different cell edges in Example 1 and Example 2 according to an embodiment of the present invention; FIG. 3(b) is an example according to an embodiment of the present invention 3 is a schematic diagram of resource blocks that are discontinuous in the frequency domain used between terminals at different cell edges; FIG. 4 (a) is an uplink transmission method for borrowing or sharing spectrum resources and channel resources of a neighboring cell according to an embodiment of the present invention; FIG. 4(b) is a flowchart of an uplink transmission method for borrowing or sharing a spectrum of a neighboring cell using macro diversity according to an embodiment of the present invention; FIG. 5 is an example of an uplink transmission method according to an embodiment of the present invention; Schematic diagram of 1; FIG. 6 is a schematic diagram of Example 2 of an uplink transmission method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS The embodiments of the present invention provide a scheme for borrowing or sharing frequency resources and channel resources of a neighboring cell for uplink transmission. The terminal mentioned in the embodiment of the present invention mainly refers to a terminal located at a cell edge, but is not limited thereto, and the resource block mentioned in the embodiment of the present invention may be but not limited to any one of the following: 1) corresponding to a specific The spectrum in the time interval; 2) The orthogonal frequency multiplexing corresponds to the subcarrier group in a specific time interval. The preferred embodiments of the present invention are described with reference to the accompanying drawings, and the preferred embodiments of the present invention are intended to illustrate and explain the invention. Embodiment 1 According to an embodiment of the present invention, an uplink transmission system that borrows or shares neighboring cell spectrum resources and channel resources is first provided. 2 is a schematic diagram of an uplink transmission system in accordance with an embodiment of the present invention. As shown in FIG. 2, the uplink transmission system includes a plurality of adjacent or adjacent wireless nodes (seven wireless nodes 201a-201g are shown in FIG. 2) and at least one terminal (shown in FIG. 2 at the wireless node 201a). A cell (User Equipment, UE) 202 of the cell in which the cell is located may be the cell or the serving cell, and the cell adjacent to the cell or the serving cell may be referred to as a neighboring cell, where 203 represents the service of the terminal. a channel, which is composed of a resource block (SRB) of a serving cell and a resource block (BRB1-BRBn) of other cells borrowed. In the system, one or more terminals located in an edge area of the serving cell and located in the serving cell One or more terminals in the edge area of the neighboring cell share a set of spectrum resources mutually exclusive in the frequency domain allocated to the edge area of the serving cell in the soft frequency multiplexing manner. In the above system, there are multiple ways for a terminal to share a set of frequency resources, including but not limited to the following: (1) Time-division between terminals belonging to different cells Sharing a set of frequency and frequency resources mutually exclusive in the frequency domain; wherein, the terminal simultaneously uses the spectrum resources belonging to the edge area of the serving cell and the spectrum resources belonging to the edge area of the neighboring cell to send signals; (2) terminals belonging to different cells Sharing a set of frequency and frequency resources mutually exclusive in the frequency domain by means of frequency hopping; wherein, the side of the serving cell A mutually orthogonal frequency hopping pattern is adopted between the terminal in the edge region and the terminal in the edge region of the neighboring cell;

(3) A group of frequency-speaking resources overlapping in the frequency domain are shared by terminals belonging to different cells in a space division manner. The implementation of the soft frequency reuse method can be understood from the following two aspects. On the one hand, the spectrum resources allocated to the cell edge region in a soft frequency multiplexing manner of one cell and the frequency resources allocated to the cell edge region in the soft frequency multiplexing manner of the neighboring cells are mutually exclusive in the frequency domain; The spectrum resource allocated to the cell edge area in a soft frequency multiplexing manner of a cell changes according to the load 'I' of the central area of the cell. When the load in the central area of the cell is light or no load, the cell can be large. Part or all of the spectrum resources are used as spectrum resources for the cell edge area. In an extreme case, such as when the load of the neighboring cell is zero, one or a group of cells located in the edge area of the cell: ^ the terminal uses the cell adjacent to the cell in which it is located Most or all of the spectrum resources of the (neighboring cell) The working mode of the uplink transmission system according to the embodiment of the present invention will be further described by way of example. Example 1 Terminal 202 uses two or more wireless nodes (the above-mentioned node selection) Wireless node 201 (201b, 201g, 201f) from the neighboring cell and wireless node 201 of the cell where the terminal 202 is located The contiguous resource blocks in the frequency domain transmit the service data in a single carrier manner. Moreover, the terminal 202a and the terminal 202b in the edge region of the cell covered by the wireless node 201g share the wireless nodes 201a, 201b, 201g, 201f in a time division manner. Frequency-latent resources of the edge region. In a specific time interval from time 1, the terminal 202a transmits data using the spectrum of the own cell and the neighboring cell, and the terminal 202b uses the cell in a specific time interval from time 2 Further, when the terminal 202a or the terminal 202b transmits data, the network may receive the signal sent by the terminal in a spatial diversity manner by using the receiving channels of the wireless nodes 201a, 201b, 201g, and 201f. To improve the efficiency of the uplink transmission. Example 2 The terminal 202 uses a wireless node 201 belonging to two or more wireless nodes (the above-mentioned node is selected from a neighboring cell (201b, 201g, 201f) and the cell where the terminal 202 is located. Continuing resource blocks in the frequency domain, transmitting service data in Orthogonal Frequency Division Multiplexing (OFDM) And, 202a in the edge region of the terminal end of the cell covered by the wireless node 202b in a time division 201g The mode shares the frequency resources of the edge regions of the wireless nodes 201a, 201b, 201g, and 201f. In a specific time interval from time 1, the terminal 202a transmits data using the spectrum of the own cell and the neighboring cell. In a specific time interval from time 2, the terminal 202b transmits data using the spectrum of the own cell and the neighboring cell. Further, when the terminal 202a or the terminal 202b transmits data, the network may use the receiving channels of the wireless nodes 201a, 201b, 201g, and 201f to receive signals sent by the terminal in a spatial diversity manner, so as to improve the frequency-by-pass efficiency of the uplink transmission. . 3(a) shows a resource block set in which the wireless nodes 201a-201g cover the edge region of the cell, and as shown in FIG. 3(a), RBa, RBb, RBf, ..., RBg are continuous. Specifically, at time 1, the frequency i of the local cell and the neighboring cell used by the terminal 202a to transmit data is continuous. At time 2, the spectrum of the local cell and the neighboring cell used by the terminal 202b to transmit data is also continuous. 3 terminal 202 uses discontinuous resource blocks in the frequency domain that belong to two or more wireless nodes (the above nodes are selected from wireless nodes (201b, 201g, 201f) of neighboring cells and wireless nodes 201 of cells in which terminal 202 is located) The service data is transmitted in a single carrier manner or in an orthogonal frequency division multiplexing manner, wherein FIG. 3(b) shows a resource block set in which the wireless nodes 201a-201g cover an edge region of the cell. RBb, RBf, ..., RBg are discontinuous. In time interval 1: terminals 202a and 202b respectively use a resource block combination to implement respective signal transmission; in time interval 2: terminals 202a and 202b respectively use another The resource block combination implements respective signal transmission. In the process of frequency hopping, the network may use the above-mentioned wireless node for spatial diversity reception to improve the spectral efficiency of the uplink transmission. Preferably, In the foregoing uplink transmission system, the wireless node may be an independent base station (a conventional base station including radio frequency and baseband processing), or may be a remote radio unit (RRU) of the distributed base station; and the antenna of the wireless node may be An antenna disposed at different sites, or an antenna covering different regions (sectors) disposed at the same site. For a terminal, the terminal includes a transmitting channel, a receiving channel, and a baseband processing unit, where the transmitting channel The bandwidth simultaneously covers part or all of the operating frequency bands of the cell in which the terminal is located and the neighboring cell, and the transmitting channel can simultaneously transmit signals using frequency of two or more cells. When the data of the channel quality indication (CQI: Channel Quality Indication) is transmitted to the network (through the control node), the channel quality indication information on the working frequency of the wireless node of the local cell is reported, and is also reported on the working spectrum of the wireless node of the cell. Channel quality indication information. Embodiment 2 According to an embodiment of the present invention, an uplink transmission method for borrowing or sharing a neighbor cell spectrum resource and a channel resource is provided, which may be applied to include multiple adjacent or adjacent wireless nodes and at least Figure 4 (a) shows a flow chart of an uplink transmission method according to an embodiment of the present invention. As shown in Figure 4 (a), the following processing may be included: Step bare S402, determining that it can participate in uplink transmission Preselecting a set of neighboring cell radio nodes; Step S404, selecting one or more working radio nodes participating in the uplink transmission from the set of pre-selected neighboring cell radio nodes; Step S406, using one or more working radio nodes in which the terminal can be used The spectrum resources and their usage are sent to the terminal. Figure 4 (b) shows the invention according to the invention A flow chart of the uplink transmission method of the macro diversity borrowing or sharing the neighboring cell spectrum resource and the channel resource is used in the embodiment. As shown in FIG. 4 (b), the following processing may be included: Step S402, determining the preselection that can participate in the uplink transmission a set of neighboring cell radio nodes; Step S404, selecting one or more working radio nodes participating in uplink transmission from a set of pre-selected neighboring cell radio nodes; Step S406, using one or more working radio nodes in which the terminal can be used The spectrum resource and its usage mode are sent to the terminal; Step S408, the network receives the signal (service data) sent by the terminal in a macro diversity manner. The macro diversity according to the embodiment of the present invention shown in FIG. 4(b) is used. The uplink transmission method further describes each processing step of the above uplink transmission method in detail. (-) Step S402 First, the base station sends a probe set consisting of a set of neighboring cell identification symbols to the terminal, where the probe set specifies a signal transmitted by a specific neighboring cell wireless node, such as a pilot signal or a characteristic parameter of the synchronization signal (eg, Frequency point, coding mode, measurement window, etc.); measurement result of the signal specified by the detection set on the terminal; the network side determines whether the signal quality of the corresponding cell reaches (including or exceeds) the threshold according to the measurement result reported by the terminal, and The wireless node of the cell whose signal quality reaches the target value is regarded as a potential pre-selected neighboring cell wireless node that can participate in the uplink transmission. It is also possible to measure the reference signal received power (Reference Symbol Received Power, RSRP for short) of the local cell and the neighboring cell to "only" the neighboring cell wireless node that can participate in the uplink transmission.

(2) Step S404: For the neighboring cell corresponding to the pre-selected neighboring cell radio node, according to the overload indication information (Overload Indication, OI), it is determined whether there is resource remaining; for the OI indication, there is no resource remaining, that is, the neighboring cell that has been overloaded, give up Borrow its frequency. For each neighboring cell with the remaining resources, the remaining amount of the resource is obtained, and the application resource borrowing amount of the neighboring cell is obtained, for example, the data can be obtained in the following two ways: 1) for the same distribution The neighboring cell of the base station is directly obtained by using the internal interface of the baseband unit (BBU); 2) for the neighboring cells belonging to different base stations (or different distributed base stations), the X2 interface between the base station and the base station is obtained. And for the neighboring cell that removes the remaining resources after applying for the borrowed resource, the wireless node is regarded as the working wireless node. For the resource borrowing between the neighboring cells under the same distributed base station, since the baseband processing unit records the load of each cell in real time, the resource borrowing between the neighboring cells is also fully grasped, so there is no need to pass the X2 between the base stations. The interface can then perform the determination of the above working node.

(3) Step S406: In this step, the resource of the cell where the terminal is located may be sent to the terminal. The network or the BBU determines the resource borrowing for each wireless node according to the remaining resources of each wireless node participating in the uplink transmission (including the wireless node of the local cell and one or more working wireless nodes determined in step S404) (borrowed resources) Number of blocks) and borrowing method (including the time of use of the resource block, usage week) Period, duration of use), and the location and usage of these resources are sent to the wireless terminal. The manner in which the terminal uses the spectrum resources of the serving cell and the edge area of the neighboring cell includes the following: (1) The terminals belonging to different cells share a set of spectrum resources mutually exclusive in the frequency domain in a time division manner; The terminal simultaneously uses the spectrum resources belonging to the edge region of the serving cell and the spectrum resources belonging to the edge region of the neighboring cell to transmit signals; (2) the terminals belonging to different cells share a mutually exclusive group in the frequency domain by frequency hopping Frequency-speaking resources; wherein, the terminal in the edge area of the cell and the terminal in the edge area of the neighboring cell adopt mutually orthogonal frequency hopping patterns; (3) the terminals belonging to different cells share the frequency in the form of space division A set of spectrum resources that overlap on a domain. Further, in this step, the network may specify the working mode of the terminal, including a single carrier mode, an OFDM mode, and a coded modulation mode.

(3) Step S408 In this step, the network (or BBU) combines the signals from different wireless nodes by using one of the following signals: Selecting the combination: selecting the best one of the several scattered signals as the reception Signal; equal gain combining: directly add several scattered signals with the same branch gain, and add the added signal as the received signal; maximum ratio combining: control the combined branch gains so that they are respectively associated with the branch The signal-to-noise ratio is proportional, and then added to obtain the received signal. The following is a further description of the invention by way of specific examples. Example 1: The uplink service data transmission of the neighboring cell spectrum resource and the channel resource between the internal nodes of the distributed base station FIG. 5 is a radio access network composed of distributed base stations, in which three sites are arranged on each site. Each RRU covers a different cell (sector), and each RRU uses a different frequency band or different orthogonal subcarriers in the same frequency band. Group: RRU1 uses frequency band fl to cover cell 1; RRU2 uses frequency band £2 to cover cell 2; RRU3 uses frequency band β to cover cell 3. A BBU control processes a total of nine RRUs on the above three sites, and each of the RUs is networked in a 1/3 frequency multiplexing manner. In the area covered by such a distributed base station, there are wireless terminals UE1 202a and UE2 202b, wherein UE1 is covered by three RUs: RRU1 501a, RRU2501b, RRU3501c, RRU1 501a are control nodes of the wireless terminal 202a, and the RRU1 501a transmits to the wireless terminal through the control channel between the wireless terminal and the wireless terminal to perform uplink transmission. Control instructions.

The BBU 502 implements the uplink transmission between the network and the wireless terminal by using the uplink transmission method in the above embodiment of the present invention. First, the BBU 502 receives the reference power according to the reference signal of the RRU around the wireless terminal 202a (RSRP: Reference symbol received). The measured quantity of power determines the RRU2 501b, and the RRU 3501c is a potential node participating in the uplink transmission (ie, the above-mentioned preselected neighboring cell radio node); then, the BBU 502 does not have a terminal using the resource in the cell covered by the RRU 3501b according to the RRU 2501b. The fact that the OI indicates that the cell load is 0. In the case of performing uplink transmission between the cells in the distributed base station, the BBU stores the load of each RRU under its jurisdiction, and does not need to obtain the lower interface of the BBU. The RRU2501b and RRU3501c are further determined to be the working nodes for uplink transmission to the terminal. Secondly, the BBU 502 determines the R U2501a, R according to the available resources of the RRU2501b and the RRU3501c and considering the role of the power control factor. According to Figure 3 (a) between U2501b and RRU3 501c The resource block allocation mode is configured to allocate a frequency domain contiguous resource block to the wireless terminal, and instruct the wireless terminal to send data to the network on the resource block in a single carrier manner. Finally, the BBU 502 uses the receiving channel and spectrum of the RRU 2501a, the RRU 2501b, and the RRU 3501c. Receive data from the wireless terminal in a maximum ratio combining manner. Example 2: Uplink service data transmission between a distributed base station borrowing neighboring cell spectrum resources and channel resources FIG. 6 is a radio access network composed of three distributed base stations (each of which is composed of FIG. 1). Within the radio access network, there is a radio terminal UE2 202b, which is covered by three RUs: RRU1 601a, RRU2601b. RRU3601c, RRU2501b is a control node of the radio terminal 202b, and the R U2501b is wirelessly connected through the control channel with the radio terminal. The terminal transmits the control commands required to implement the uplink transmission.

The BBU3 602c implements uplink transmission between the network and the wireless terminal by using the uplink transmission method according to the embodiment of the present invention: First, the BBU3 602c determines the RRU1 601a, the RRU3 601c is a potential node participating in the uplink transmission according to the measurement quantity of the reference signal received power (RSRP: Reference Symbol received power) of the RU around the wireless terminal 202b. , the foregoing pre-selected neighboring cell radio node); then, the BBU3 602c according to the load indication of the cell covered by the RRU1 601a. R U3 601c

(For example, the OI indication transmitted from the BBU2 through the X2 interface) and the RRU1 601a, RRU3 601c resources are requested to be borrowed (the BBU2 sends an indication to the BBU3 that the resource is requested to be borrowed through the X2 interface), and further the RRU1 601a, RRU3 601c The working node that is determined to receive the uplink service data from the terminal; secondly, the BBU3 602c determines the resource block condition that the terminal can use according to the resource remaining condition of the RRU1 601a, the RRU3 601c, as shown in FIG. 3( a ), and then, the BBU3 602c ^& RRU1 601a and The resource blocks and receiving time slots that the RRU3 601c needs to bear are transmitted to the BBU 2 through the X2 interface. Finally, under the control of BBU2, RRU1 601a and RRU3 601c and RRU2 501b respectively receive data transmitted by the wireless terminal on the designated resource block. The data received by the RRU1 601a and the RRU3 601c through the X2 interface 4b is sent to the BBU3, and the data received by the BBU3 for the RRU1 601a and the RRU3 601c and the RRU2 501b is subjected to macro diversity combining. As described above, by means of the present invention, the diversity reception gain between cells can be further obtained by borrowing not only the frequency resources of the neighboring cells but also the channel resources of the neighboring cells, and the frequency space can be maintained by combining the power control measures. When the multiplexing format is unchanged and the neighboring cell guards are controlled, the spectrum of multiple neighboring cells that can be used by the terminal is improved, so that the uplink transmission rate and frequency of the terminal in the cell edge region can be improved in a larger area. Leverage efficiency. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

An uplink transmission system that borrows or shares a neighboring cell spectrum resource and a channel resource, and includes a plurality of adjacent or adjacent wireless nodes and at least one terminal, where the cell where the terminal is located is a serving cell, and is characterized in that:

One or more terminals located in an edge area of the serving cell and one or more terminals located in an edge area of the neighboring cell of the serving cell share the neighboring cells of the serving cell and the serving cell and are allocated to d in a soft frequency reuse manner. A set of frequency resources in the edge area of the area.

The uplink transmission system according to claim 1, wherein the terminals belonging to different cells share the set of frequency transmission resources in a time division manner; wherein, the terminals simultaneously use the monthly service A frequency resource of an edge region of the cell and a spectrum resource belonging to an edge region of the neighboring cell transmit a signal.

The uplink transmission system according to claim 1, wherein the terminals belonging to different cells share the set of spectrum resources in a frequency hopping manner; wherein, the terminal and the edge area of the serving cell A mutually orthogonal hopping pattern is adopted between terminals of the edge region of the neighboring cell.

The uplink transmission system according to claim 1, wherein the group of frequency borrowing resources are shared by the terminals belonging to different cells in a space division manner.

The uplink transmission system according to any one of claims 1 to 4, wherein the terminal transmits a signal in any of the following manners:

The terminal transmits a signal in a sheep carrier manner or an orthogonal frequency division multiplexing manner by using resource blocks that are consecutive in the frequency domain belonging to two or more wireless nodes; wherein, the two or more The wireless node is selected from a wireless node of the serving cell and a wireless node of the neighboring cell; or

The terminal uses a resource block of frequency i or upper discontinuity belonging to two or more wireless nodes to transmit signals in a single carrier manner or orthogonal frequency division multiplexing manner; wherein, the two or two The above wireless node is selected from a wireless node of the monthly cell and a wireless node of the neighboring cell.

6. The uplink transmission system according to claim 5, wherein the adjacent or adjacent wireless node receives the edge region of the serving cell and/or the edge region of the neighboring cell in a spatial diversity manner. The signal sent by the terminal inside.

The uplink transmission system according to any one of claims 1 to 4, characterized in that

The wireless node includes: an independent base station, and a remote radio unit of the distributed base station; the antenna of the wireless node includes: an antenna disposed at different sites, and an antenna covering different regions disposed at the same site;

The terminal includes a transmitting channel, a receiving channel, and a baseband processing unit, where a bandwidth of the transmitting channel covers a part or all of a working frequency band of the serving cell and the neighboring cell, and the transmitting channel can use two Or the frequency of two or more cells sends a signal.

An uplink transmission method for borrowing or sharing a neighboring cell spectrum resource and a channel resource, for a system comprising a plurality of adjacent or adjacent wireless nodes and at least one terminal, comprising:

Determining a set of pre-selected neighboring cell radio nodes that can participate in uplink transmission; selecting one or more working radio nodes participating in uplink transmission from the set of pre-selected neighboring cell radio nodes; performing the one or more jobs that the terminal can use The spectrum resource of the edge area of the cell where the wireless node is located and the manner of its use are sent to the terminal;

9. The uplink transmission method according to claim 8, wherein:

The determining, by the base station, the detection of the pre-selected neighboring cell radio node set is: the base station sends, to the terminal, a detection set formed by a group of neighboring cell identification symbols, where the detection set specifies a signal transmitted by a specific neighboring cell radio node. a measurement result of a signal specified by the terminal on the detection set;

The network side #■ determines whether the signal quality of the corresponding cell reaches the threshold according to the measurement result of the terminal, and uses the wireless node of the cell whose signal quality reaches the threshold as the pre-selected neighboring cell wireless node that can participate in the uplink transmission;

The operation of selecting the multiple working wireless nodes is specifically: For the neighboring cell corresponding to the pre-selected neighboring cell radio node, it is determined whether there is resource remaining according to the overload indication information; for each neighboring cell with the remaining resources, respectively, the remaining amount of the resource is obtained, and the application resource of the neighboring cell is obtained. Borrowing amount

For the neighboring cell whose remaining resource amount after the borrowed resource is removed, the wireless node is regarded as the working wireless node.

10. The uplink transmission method according to claim 8, wherein the usage of the spectrum resource includes any one of the following:

The terminal belonging to different cells share a set of spectrum resources in a time-division manner; wherein, the terminal simultaneously uses a spectrum resource belonging to an edge area of the serving cell and a spectrum resource belonging to an edge area of the neighboring cell to send a signal;

Between the terminals belonging to the different cells, the hopping frequency is used to share a set of spectrum resources; wherein, the terminal of the edge area of the serving cell and the terminal of the edge area of the neighboring cell adopt mutually orthogonal hopping patterns;

A group of spectrum resources are shared by terminals belonging to different cells in a space division manner.

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

The network sends the resource location of the cell where the terminal is located and the usage manner thereof to the terminal;

The network receives the signal transmitted by the terminal in a macro diversity manner.