CN106470050B - Method for realizing coordinated multi-point CoMP downlink transmission between base stations and corresponding base station - Google Patents

Method for realizing coordinated multi-point CoMP downlink transmission between base stations and corresponding base station Download PDF

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CN106470050B
CN106470050B CN201510493462.6A CN201510493462A CN106470050B CN 106470050 B CN106470050 B CN 106470050B CN 201510493462 A CN201510493462 A CN 201510493462A CN 106470050 B CN106470050 B CN 106470050B
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base station
frequency
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CN106470050A (en
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王令斌
周敬
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]

Abstract

A method for realizing coordinated multi-point CoMP downlink transmission among base stations and a corresponding base station are disclosed, wherein the base station sends signaling to UE which supports CA and judges to adopt a CoMP mode to perform downlink transmission, and indicates the UE to use an HARQ process of an unused CA auxiliary carrier for CA main carrier data transmission; when the base station determines that the CoMP cooperation adjacent cells of the UE comprise the same-frequency adjacent cells under other base stations, downlink data of the UE are scheduled in advance on the HARQ process of the main cell, and the downlink data and time-frequency resource information of the downlink data are sent to the same-frequency adjacent cells under other base stations to perform CoMP downlink transmission. The invention can support the elimination of same frequency interference under the non-ideal transmission of cross-station by scheduling and multiplexing the HARQ process of the CA auxiliary carrier in advance through the main cell, improve the utilization rate of the edge user frequency band and expand the CoMP application space.

Description

Method for realizing coordinated multi-point CoMP downlink transmission between base stations and corresponding base station
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method for performing coordinated multipoint (CoMP) downlink Transmission and a corresponding base station.
Background
Hybrid Automatic Repeat reQuest (HARQ) is one of the key technologies of the physical layer in an Orthogonal Frequency Division Multiple Access (OFDMA) system. By utilizing the HARQ retransmission function and the time diversity technology, the performance index of the wireless system can be effectively improved, and the communication quality of the system is obviously improved.
The LTE (Long Term Evolution) uplink system will adopt the same-frequency HARQ technology, and the downlink system adopts the asynchronous adaptive HARQ technology.
HARQ uses a SAW (Stop-And-Wait) retransmission protocol. The mechanism is simple and reliable, the system signaling overhead is small, and the requirement on the buffer space of the receiver is reduced. However, the channel utilization efficiency of the protocol is low, and after one transmission of one HARQ process is sent, at least the next transmission needs to wait for the rtt (round Trip time). In RTT, an evolved node b (enode)/User Equipment (UE) can only stop transmission and wait, and in order to avoid adverse effects, the LTE system adopts an N-process stop-and-wait protocol, that is, a transmitting end runs N sets of different SAW protocols on a channel in parallel to transmit data and signaling in an interleaved manner, thereby improving the channel utilization.
In the current LTE FDD (Frequency Division duplex) system, the number of HARQ processes is related to RTT, the protocol requires that RTT is 8ms, i.e. the interval between two transmissions of the same HARQ process is 8ms, and it is specified that a maximum of 8 HARQ processes are supported, so as to ensure that each TTI of a specific UE can be scheduled. In an LTE TDD (Time Division duplex) system, the RTT is 8ms to 16ms according to different uplink and downlink configurations, and 8 to 15 HARQ processes can be supported.
Carrier Aggregation (CA) refers to a base station aggregating 2 or more Component Carriers (CC) together to provide a service for a UE, which significantly improves the throughput of a single user, and the component carriers are at most 5; each at most 20 MHz; may be adjacent in frequency or may be spaced apart. A Carrier for maintaining RRC connection for a user is called a Primary Carrier (PCC), and a cell using the Primary Carrier is a Primary cell (Pcell) which may also be called a Primary cell; the carriers other than the primary Carrier are called Secondary carriers (SCCs), and the cell using the Secondary Carrier is a Secondary cell (Scell). The UE side maintains an equal number of HARQ processes for each carrier.
Coordinated multi-point transmission/reception (CoMP) is a technology for improving cell edge throughput, increasing high-speed data service coverage, and improving system throughput by reducing or eliminating co-channel interference in an LTE-a network. The CoMP technology reduces Co-Channel Interference (CCI) between cells, improves signal quality of users, improves performance of edge users, and improves overall performance of a system by cooperative scheduling or joint processing between multiple cells.
Coordinated multipoint (CoMP) is an application of Multiple Input Multiple Output (MIMO) technology in multiple cells (as shown in fig. 1), and may also be referred to as multipoint coordination, coordinated multipoint transmission, or coordinated multipoint transmission/Reception. In uplink, joint reception is generally adopted, and uplink signals of the same user are received and processed simultaneously among a plurality of cells (or a plurality of base stations), so that reception diversity gain and power gain are obtained; joint transmission is generally adopted in a downlink, downlink signals of the same user are simultaneously transmitted among a plurality of cells (or a plurality of base stations), interference of users at the edge of the cells is reduced, transmission diversity gain and power gain are obtained, co-frequency interference of the same frequency domain resources of other cells is effectively reduced, and throughput of the users at the edge is improved.
The inventor of the invention discovers through research that the CoMP technology can effectively eliminate the same frequency interference, obtain MIMO diversity gain and improve the frequency spectrum utilization rate; however, when the CoMP technology eliminates downlink co-channel interference (if no special description is given, the co-channel interference mentioned in the present application refers to downlink co-channel interference), the requirement on the real-time performance of data transmission is quite high; CoMP is supported during non-ideal transmission between eNodeBs, and meanwhile, asynchronous HARQ stop-wait protocols are also supported, so that the HARQ process is available in each TTI of the UE; however, the Transmission network between enodebs in the current network is generally a non-ideal PTN network, the delay is about several milliseconds, and it is difficult to satisfy the full scheduling requirement that each Transmission Time Interval (TTI) of the UE has an HARQ process available. Therefore, the current CoMP application stays in the eNodeB, and the entire network cannot be seamlessly covered, so that the CoMP performance is greatly reduced in the actual mobile network application.
Disclosure of Invention
In view of the above, the present invention provides the following technical solutions.
A method for determining maximum transmission delay between base stations supported by User Equipment (UE) comprises the following steps:
for UE supporting carrier aggregation CA and judging downlink transmission in a coordinated multi-point CoMP mode, a base station determines the use state of a CA auxiliary carrier supported by the UE, wherein the use state is in use or not in use;
and the base station takes the sum of RTTs of the CA auxiliary carriers which are not used by the UE as the maximum transmission time delay between the base stations supported by the UE.
Optionally
The base station uses the sum of the RTTs of the CA secondary carriers not used by the UE as the maximum transmission delay between the base stations supported by the UE, and includes:
calculating the maximum transmission time delay T between the base stations supported by the UE according to the following formulaDELAY-MAX：
TDELAY-MAX＝TRTT*(NMAX_CC-NCFG_CC)
Wherein, TRTTAn RTT for each CA secondary carrier supported by the UE; n is a radical ofMAX_CCThe maximum number of the CA auxiliary carriers supported by the UE; n is a radical ofCFG_CCThe number of the CA auxiliary carriers used by the UE.
A method for selecting a coordinated multi-point (CoMP) coordinated neighbor cell comprises the following steps:
the method of claim 1 or 2, wherein the base station determines the maximum transmission delay T between base stations which support carrier aggregation CA and determine UE support for downlink transmission in CoMP modeDELAY-MAX；
The base station selects one or more same-frequency adjacent cells as CoMP cooperative adjacent cells from the same-frequency adjacent cells of which the UE meets the time delay condition; wherein, the time delay condition is that the transmission time delay from the base station to the base station of the same-frequency adjacent region is less than or equal to TDELAY-MAX。
Optionally
And the transmission time delay from the base station to which the same-frequency adjacent region belongs is obtained by pre-measurement and stored in the base station.
Optionally
The base station selects one or more same-frequency adjacent cells as CoMP cooperation adjacent cells from the same-frequency adjacent cells of which the UE meets the time delay condition, and the method comprises the following steps:
and the base station selects one or more same-frequency adjacent cells with the maximum interference with the main cell from the same-frequency adjacent cells of which the UE meets the time delay condition as CoMP cooperative adjacent cells.
A method for realizing multi-point coordinated CoMP downlink transmission among base stations comprises the following steps:
a base station sends a signaling to UE which supports carrier aggregation CA and judges to adopt a CoMP mode to carry out downlink transmission, and the UE is indicated to use a hybrid automatic repeat request HARQ process of unused CA auxiliary carriers for CA main carrier data transmission;
the base station determines a CoMP cooperative adjacent cell of the UE according to the method;
and when the CoMP cooperative neighboring cells comprise the same-frequency neighboring cells under other base stations, the base station schedules the downlink data of the UE in advance on the HARQ process of the main cell and sends the downlink data and the time-frequency resource information thereof to the same-frequency neighboring cells under other base stations for CoMP downlink transmission.
Optionally
The determined CoMP cooperative adjacent cell comprises a same-frequency adjacent cell under another base station;
the base station schedules downlink data of the UE in advance on a main cell HARQ process and sends the downlink data and time-frequency resource information thereof to the same-frequency adjacent cells under other base stations for CoMP downlink transmission, and the method comprises the following steps:
at t0At the moment, after downlink data of the UE is scheduled on a HARQ process of a main cell, the downlink data is cached, and meanwhile, the downlink data and time-frequency resource information thereof are sent to the same-frequency adjacent cell under the other base station;
at t0+tdelayAt the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource; wherein, tdelayIs the transmission delay from the local base station to the other base station.
Optionally
The determined CoMP cooperative adjacent cells comprise K same-frequency adjacent cells under other base stations, and K is more than or equal to 2;
the base station schedules downlink data of the UE in advance on a main cell HARQ process and sends the downlink data and time-frequency resource information thereof to the same-frequency adjacent cells under other base stations for CoMP downlink transmission, and the method comprises the following steps:
determining the transmission time delay t from the base station to the base stations of the K same-frequency adjacent cellsdelay(i) Maximum value of (1)delay-maxWherein, tdelay(i) The transmission delay from the base station to the base station of the ith co-frequency adjacent cell is 1, 2.
At t0Scheduling the time on the primary cell HARQ processAfter downlink data of the UE, caching the downlink data, and simultaneously sending the downlink data, time-frequency resources thereof and information of sending time to the K same-frequency adjacent cells, wherein the sending time t istransmit＝t0+tdelay-max；
At ttransmitAnd at the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource.
Optionally
The determined CoMP cooperative adjacent cells comprise K same-frequency adjacent cells under other base stations, and K is more than or equal to 2;
the base station schedules downlink data of the UE in advance on a main cell HARQ process and sends the downlink data and time-frequency resource information thereof to the same-frequency adjacent cells under other base stations for CoMP downlink transmission, and the method comprises the following steps:
determining the transmission time delay t from the base station to the base stations of the K same-frequency adjacent cellsdelay(i) Maximum value of (1)delay-maxWherein, tdelay(i) The transmission delay from the base station to the base station of the ith co-frequency neighboring cell in the K co-frequency neighboring cells is 1, 2.
At t0At the moment, after the downlink data of the UE is scheduled on the HARQ process of the main cell, the downlink data is cached, and the time t is0+(tdelay-max-tdelay(i) The downlink data and the time-frequency resource information thereof are sent to the ith same-frequency adjacent cell at the moment;
at t0+tdelay-maxAnd at the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource.
Optionally
The base station performs CoMP downlink transmission, including:
and the base station sends the cross-carrier downlink control information to the CA auxiliary carrier used for CA main carrier data transmission in the HARQ process through the physical downlink control channel of the main carrier.
A delay determining apparatus, configured to determine a maximum transmission delay between base stations supported by a user equipment UE, comprising:
an information acquisition module, configured to determine, for a UE that supports carrier aggregation CA and determines downlink transmission in a coordinated multipoint CoMP manner, a use state of a CA auxiliary carrier supported by the UE, where the use state is in use or unused;
and a delay determining module, configured to use the sum of RTTs of CA secondary carriers not used by the UE as the maximum transmission delay between base stations supported by the UE.
Alternatively,
the step of using the sum of RTTs of CA secondary carriers not used by the UE as the maximum transmission delay between base stations supported by the UE includes:
calculating the maximum transmission time delay T between the base stations supported by the UE according to the following formulaDELAY-MAX：
TDELAY-MAX＝TRTT*(NMAX_CC-NCFG_CC)
Wherein, TRTTAn RTT for each CA secondary carrier supported by the UE; n is a radical ofMAX_CCThe maximum number of the CA auxiliary carriers supported by the UE; n is a radical ofCFG_CCThe number of the CA auxiliary carriers used by the UE.
A collaborative neighbor selection apparatus, comprising:
the delay determining apparatus according to claim 11 or 12, configured to determine the maximum transmission delay T between base stations supported by the UE that supports carrier aggregation CA and determines downlink transmission in a CoMP mannerDELAY-MAX；
The cooperative adjacent cell selection device is used for selecting one or more same-frequency adjacent cells from the same-frequency adjacent cells of which the UE meets the time delay condition as CoMP cooperative adjacent cells; the time delay condition means that the transmission time delay from the base station to the base station of the same-frequency adjacent region is less than or equal to TDELAY-MAX。
Alternatively,
the collaborative neighbor cell selection apparatus further includes: the time delay storage device is used for storing the detected transmission time delay from the local base station to the adjacent base station;
and the cooperative adjacent cell selection device acquires the transmission time delay from the base station to which the same-frequency adjacent cell belongs from the time delay storage device.
Alternatively,
the cooperative neighbor cell selection device selects one or more same-frequency neighbor cells as CoMP cooperative neighbor cells from the same-frequency neighbor cells of which the UE meets the time delay condition, and the method comprises the following steps: and selecting one or more same-frequency adjacent cells with the maximum interference with the main cell from the same-frequency adjacent cells of which the UE meets the time delay condition as CoMP cooperative adjacent cells.
A base station, comprising:
the CoMP control device is used for calling the signaling sending device and the cooperative neighbor cell selection device after judging that the UE supporting carrier aggregation performs downlink transmission in a cooperative multi-point CoMP mode; after the cooperative neighbor cell selection device returns the selected CoMP cooperative neighbor cell, calling a CoMP processing device;
collaborative neighbor selection means employing the collaborative neighbor selection means as recited in any one of claims 13-15;
a signaling sending device, configured to send a signaling to the UE, and instruct the UE to use an unused HARQ process for CA secondary carrier for CA primary carrier data transmission;
and the CoMP processing device is used for scheduling the downlink data of the UE in advance on a HARQ process of the main cell and sending the downlink data and time-frequency resource information thereof to the same-frequency adjacent cells under other base stations to perform CoMP downlink transmission when the CoMP coordinated adjacent cells comprise the same-frequency adjacent cells under other base stations.
Alternatively,
the CoMP cooperative adjacent cell selected by the cooperative adjacent cell selection device comprises a same-frequency adjacent cell under another base station;
the CoMP processing device schedules downlink data of the UE in advance on a primary cell HARQ process and sends the downlink data and time-frequency resource information thereof to the same-frequency neighboring cells under the other base stations to perform CoMP downlink transmission, including:
at t0At the moment, after the downlink data of the UE is scheduled on the HARQ process of the main cell, the downlink data is cached, and simultaneously the downlink data and the time-frequency resource information thereof are sentGiving the same-frequency adjacent region under the other base station;
at t0+tdelayAt the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource; wherein, tdelayIs the transmission delay from the local base station to the other base station.
Alternatively,
the CoMP cooperative adjacent cells selected by the cooperative adjacent cell selection device comprise K same-frequency adjacent cells under other base stations, and K is more than or equal to 2;
the CoMP processing device schedules downlink data of the UE in advance on a primary cell HARQ process and sends the downlink data and time-frequency resource information thereof to the same-frequency neighboring cells under the other base stations to perform CoMP downlink transmission, including:
determining the transmission time delay t from the base station to the base stations of the K same-frequency adjacent cellsdelay(i) Maximum value of (1)delay-maxWherein, tdelay(i) The transmission delay from the base station to the base station of the ith co-frequency adjacent cell is 1, 2.
At t0At the moment, after downlink data of the UE is scheduled on a HARQ process of a main cell, the downlink data is cached, and simultaneously the downlink data, time-frequency resources thereof and information of sending time are sent to the K same-frequency adjacent cells, wherein the sending time t istransmit＝t0+tdelay-max；
At ttransmitAnd at the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource.
Alternatively,
the CoMP cooperative adjacent cells selected by the cooperative adjacent cell selection device comprise K same-frequency adjacent cells under other base stations, and K is more than or equal to 2;
the CoMP processing device schedules downlink data of the UE in advance on a primary cell HARQ process and sends the downlink data and time-frequency resource information thereof to the same-frequency neighboring cells under the other base stations to perform CoMP downlink transmission, including:
determining the transmission time delay t from the base station to the base stations of the K same-frequency adjacent cellsdelay(i) Maximum ofValue tdelay-maxWherein, tdelay(i) The transmission delay from the base station to the base station of the ith co-frequency neighboring cell in the K co-frequency neighboring cells is 1, 2.
At t0At the moment, after the downlink data of the UE is scheduled on the HARQ process of the main cell, the downlink data is cached, and the time t is0+(tdelay-max-tdelay(i) The downlink data and the time-frequency resource information thereof are sent to the ith same-frequency adjacent cell at the moment;
at t0+tdelay-maxAnd at the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource.
Alternatively,
the signaling sending device is further configured to send cross-carrier downlink control information to a CA secondary carrier, which is used for CA primary carrier data transmission in the HARQ process, through a physical downlink control channel of the primary carrier when CoMP downlink transmission is performed.
According to the method and the corresponding base station, the transmission delay between the base stations such as eNodeBs is overcome by scheduling in advance through the main cell, the problem caused by the fact that RTT of the HARQ is lengthened due to scheduling in advance is solved by multiplexing the HARQ process of the CA auxiliary carrier, the elimination of co-channel interference under the condition of cross-station non-ideal transmission can be supported, the utilization rate of the edge user frequency band is improved, and the CoMP application space is expanded.
Drawings
Figure 1 is a schematic diagram of CoMP technology application;
FIG. 2 is a flow chart of a first embodiment of the present invention;
FIG. 3 is a block diagram of a first embodiment of the present invention;
FIG. 4 is a flow chart of a second embodiment of the present invention;
FIG. 5 is a block diagram of a second embodiment of the present invention;
FIG. 6 is a flow chart of a third embodiment of the present invention;
fig. 7 is a block diagram of a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
CoMP transmission requires two or more cells to serve the same UE, for example two cells not in the same base station. The cell to which the UE accesses is called the primary cell or serving cell, and the other cell is called the cooperating cell. The CoMP technology requires that the main cell and the cooperative neighboring cell transmit the same data on the same time-frequency resource for the UE; the data source can only be generated in the main cell; the process is as follows:
t0scheduling data (in a data packet form) of the UE on a HARQ process of a main cell, caching the data by the main cell and simultaneously sending the data to a cooperative adjacent cell;
assuming that the transmission delay between base stations of two cells is Δ t, at time t0When the data is positive delta t, the cooperative neighbor cell receives the data;
at t0And at the moment of +/-deltat, the main cell sends the cached data packet to the UE, and the cooperative neighbor cell sends the received data to the UE.
As described above, due to CoMP, after the primary cell schedules downlink data of the UE in the HARQ process, it needs to buffer the data packet for Δ t time before sending the data packet to the UE. This means that the waiting time required between the HARQ process secondary transmissions, i.e. RTT, increases by Δ t, which results in that the primary cell cannot be scheduled fully under the current HARQ number. There is a need for a protocol to plan higher levels of UE capability to support more HARQ processes. Therefore, the invention provides a method for realizing CoMP between base stations. In the following embodiments, the base station is an eNodeB as an example, but the invention is not limited thereto.
Example one
The present embodiment relates to a method for determining a maximum transmission delay between base stations supported by a UE, as shown in fig. 2, the method includes:
step 110, for a UE supporting carrier aggregation CA and deciding downlink transmission in a coordinated multipoint CoMP manner, a base station determines a use state of a CA auxiliary carrier supported by the UE, where the use state is in use or not in use;
for the accessed UE, the base station may know whether the UE supports the CA and the maximum number of the secondary carriers supported by the UE. The base station may notify the UE through the RCC signaling to configure the supported CA secondary carrier for data transmission on the CA secondary carrier. And if the CA auxiliary carrier supported by the UE is not configured, the CA auxiliary carrier is not used.
And step 120, the base station uses the sum of RTTs of CA secondary carriers not used by the UE as the maximum transmission delay between base stations supported by the UE.
If the RTT of each CA secondary carrier is the same (referred to as the RTT of the CA secondary carrier HARQ), the maximum transmission delay T between the base stations supported by the UE can be calculated according to the following formulaDELAY-MAX：
TDELAY-MAX＝TRTT*(NMAX_CC-NCFG_CC)
Wherein, TRTTAn RTT for each CA secondary carrier supported by the UE; n is a radical ofMAX_CCThe maximum number of the CA auxiliary carriers supported by the UE; n is a radical ofCFG_CCThe number of the CA auxiliary carriers used by the UE. In LTE FDD systems, the RTT for each carrier component is the same and can be calculated using the above equation. In case of LTE TDD system, RTT of each carrier component may be different, and the RTT of each unused CA secondary carrier needs to be added to calculate TDELAY-MAX。
Correspondingly, the present embodiment further provides a delay determining apparatus, configured to determine a maximum transmission delay between base stations supported by a user equipment UE, as shown in fig. 3, where the delay determining apparatus includes:
an information obtaining module 10, configured to determine, for a UE that supports carrier aggregation CA and determines downlink transmission in a coordinated multipoint CoMP manner, a use state of a CA auxiliary carrier supported by the UE, where the use state is in use or not in use;
a delay determining module 20, configured to use the sum of RTTs of CA secondary carriers not used by the UE as the maximum transmission delay between base stations supported by the UE.
Alternatively,
the step of using the sum of RTTs of CA secondary carriers not used by the UE as the maximum transmission delay between base stations supported by the UE includes:
calculating the maximum transmission time delay T between the base stations supported by the UE according to the following formulaDELAY-MAX：
TDELAY-MAX＝TRTT*(NMAX_CC-NCFG_CC)
Wherein, TRTTAn RTT for each CA secondary carrier supported by the UE; n is a radical ofMAX_CCThe maximum number of the CA auxiliary carriers supported by the UE; n is a radical ofCFG_CCThe number of the CA auxiliary carriers used by the UE.
Example two
In this embodiment, a CoMP cooperative neighboring cell is selected for the UE based on the determined maximum transmission delay between the base stations supported by the UE in the first embodiment.
As shown in fig. 4, the method for selecting a CoMP cooperative neighboring cell in this embodiment includes:
step 210, the base station determines the maximum transmission delay T between the base stations supporting the CA and determining the UE supporting downlink transmission in the CoMP manner according to the method described in the first embodimentDELAY-MAX；
Step 220, the base station selects one or more same-frequency adjacent cells as CoMP cooperative adjacent cells from the same-frequency adjacent cells of which the UE meets the time delay condition; the time delay condition means that the transmission time delay from the base station to the base station of the same-frequency adjacent region is less than or equal to TDELAY-MAX。
In this step, the same-frequency neighboring cells of the UE may be obtained according to the report of the UE. The transmission delay from the base station to the base station belonging to the same-frequency adjacent region can be obtained by pre-measurement and stored in the base station.
In this step, when the CoMP cooperating neighbor cell is selected, one or more same-frequency neighbor cells with the largest interference with the main cell may be selected as the CoMP cooperating neighbor cell. Specifically, the common-frequency neighboring cells meeting the time delay condition may be selected from the common-frequency neighboring cells reported by the UE to form a CoMP candidate neighboring cell set, and the common-frequency neighboring cells in the CoMP candidate neighboring cell set may be sorted in order of decreasing interference with the primary cell; and then selecting the 1 st or the first K same-frequency adjacent cells as CoMP cooperative adjacent cells. The amount of interference with the primary cell can be measured by the difference between the RSRP of the same-frequency neighboring cell (Reference Signal Receiving Power) and the RSRP of the primary cell.
Correspondingly, this embodiment further provides a collaborative neighboring cell selection apparatus, as shown in fig. 5, including:
a delay determining device 40, which is the delay determining device according to the first embodiment, and is configured to determine the maximum transmission delay T between base stations supported by the UE that supports carrier aggregation CA and determines downlink transmission in a CoMP mannerDELAY-MAX；
A coordinated neighbor cell selection device 50, configured to select one or more co-frequency neighbor cells as CoMP coordinated neighbor cells from the co-frequency neighbor cells for which the UE meets the time delay condition; the time delay condition means that the transmission time delay from the base station to the base station of the same-frequency adjacent region is less than or equal to TDELAY-MAX。
Alternatively,
the collaborative neighbor cell selection apparatus further includes: and the time delay storage device is used for storing the detected transmission time delay from the local base station to the adjacent base station. And the cooperative adjacent cell selection device acquires the transmission time delay from the base station to which the same-frequency adjacent cell belongs from the time delay storage device. In other embodiments, the detected transmission delay from the local base station to the neighboring base station may be stored in a centralized manner on a certain network entity, and the cooperative neighboring cell selection apparatus obtains the transmission delay from the local base station to the base station to which the neighboring cells of the same frequency belong by querying.
Alternatively,
the cooperative neighbor cell selection device selects one or more same-frequency neighbor cells as CoMP cooperative neighbor cells from the same-frequency neighbor cells of which the UE meets the time delay condition, and the method comprises the following steps: and selecting one or more same-frequency adjacent cells with the maximum interference with the main cell from the same-frequency adjacent cells of which the UE meets the time delay condition as CoMP cooperative adjacent cells.
EXAMPLE III
In this embodiment, based on the CoMP coordinated neighboring cell selected for the UE in the second embodiment, multi-point coordinated CoMP downlink transmission between base stations is implemented.
Fig. 6 shows a method for implementing CoMP transmission between base stations according to this embodiment, which includes:
step 310, a base station sends signaling to a UE which supports carrier aggregation CA and judges to adopt a CoMP mode to perform downlink transmission, and the UE is indicated to use an unused HARQ process of a hybrid automatic repeat request of a CA auxiliary carrier for CA main carrier data transmission;
the signaling in this step may be, for example, an auxiliary carrier reconfiguration signaling, and the HARQ process of the CA auxiliary carrier is used for CA main carrier data transmission through the auxiliary carrier reconfiguration, but is not limited to this.
Step 320, the base station determines a CoMP cooperative neighboring cell of the UE according to the method described in the second embodiment;
step 330, when the CoMP cooperative neighboring cells include the same-frequency neighboring cells under other base stations, the base station schedules downlink data of the UE in advance in a HARQ process of a primary cell and sends the downlink data and time-frequency resource information thereof to the same-frequency neighboring cells under other base stations, so as to perform CoMP downlink transmission.
In this step, if the determined CoMP cooperative neighboring cell includes a co-frequency neighboring cell under another base station, the CoMP cooperative neighboring cell may be processed in the following manner:
at t0At the moment, after downlink data of the UE is scheduled on a HARQ process of a main cell, the downlink data is cached, and meanwhile, the downlink data and time-frequency resource information thereof are sent to the same-frequency adjacent cell under the other base station;
at t0+tdelayAt the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource; wherein, tdelayIs the transmission delay from the local base station to the other base station.
In this step, if the determined CoMP cooperative neighboring cells include K same-frequency neighboring cells under other base stations, where K is greater than or equal to 2, the following processing may be performed:
determining the transmission time delay t from the base station to the base stations of the K same-frequency adjacent cellsdelay(i) Maximum value of (1)delay-maxWherein, tdelay(i) The transmission delay from the base station to the base station of the ith co-frequency adjacent cell is 1, 2.
At t0At the moment, after the downlink data of the UE is scheduled on the HARQ process of the main cell, the downlink data is cachedAnd row data, and simultaneously sending the downlink data, time-frequency resources thereof and information of sending time to the K same-frequency adjacent cells, wherein the sending time t istransmit＝t0+tdelay-max；
At ttransmitAnd at the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource.
In this step, if the determined CoMP cooperative neighboring cells include K same-frequency neighboring cells under other base stations, where K is greater than or equal to 2, the following two processing methods may also be performed:
determining the transmission time delay t from the base station to the base stations of the K same-frequency adjacent cellsdelay(i) Maximum value of (1)delay-maxWherein, tdelay(i) The transmission delay from the base station to the base station of the ith co-frequency neighboring cell in the K co-frequency neighboring cells is 1, 2.
At t0At the moment, after the downlink data of the UE is scheduled on the HARQ process of the main cell, the downlink data is cached, and the time t is0+(tdelay-max-tdelay(i) The downlink data and the time-frequency resource information thereof are sent to the ith same-frequency adjacent cell at the moment;
at t0+tdelay-maxAnd at the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource.
In the above processes, after receiving the downlink data and the time-frequency resource information thereof sent by the base station, the base station to which the cooperative neighboring cell belongs does not schedule the user of the cell on the time-frequency resource, so as to avoid generating co-frequency interference. Through the following processing, the main cell and the cooperative neighbor cell can send the same downlink radio frequency data for a specific user on the same frequency domain resource at the same air interface moment, so that the transmit diversity gain and the power gain are improved;
in addition, when the base station performs CoMP downlink transmission, the cross-carrier downlink control information may be sent to the CA secondary carrier, which is used by the HARQ process for CA primary carrier data transmission, through the physical downlink control channel PDCCH of the primary carrier. After receiving a signaling that an unused HARQ process of a CA auxiliary carrier is used for CA main carrier data transmission, UE blindly detects Downlink Control Information (DCI) of a CA cross-carrier in a PDCCH of a main cell, performs PDSCH detection on time-frequency resources of the main cell according to the indication of the DCI after detecting the DCI of the CA auxiliary carrier, and feeds back ACK/NACK signaling in the main cell.
Correspondingly, the present embodiment further provides a base station, as shown in fig. 7, including:
a CoMP control device 60, configured to invoke a signaling sending device and a coordinated neighbor cell selection device after determining that the UE supporting carrier aggregation performs downlink transmission in a coordinated multi-point CoMP manner; after the cooperative neighbor cell selection device returns the selected CoMP cooperative neighbor cell, calling a CoMP processing device;
a collaborative neighbor cell selection apparatus 70, which adopts the collaborative neighbor cell selection apparatus described in the second embodiment;
a signaling sending device 80, configured to send a signaling to the UE, instructing the UE to use an unused HARQ process for CA secondary carrier for CA primary carrier data transmission;
a CoMP processing device 90, configured to schedule downlink data of the UE in advance on a HARQ process of a primary cell and send the downlink data and time-frequency resource information thereof to co-frequency neighboring cells under other base stations when the CoMP-coordinated neighboring cells include co-frequency neighboring cells under other base stations, so as to perform CoMP downlink transmission.
The CoMP control device 60, the coordinated neighbor cell selection device 70, and the CoMP processing device 90 may implement their functions by matching hardware such as a processor and a memory in the base station with corresponding software. The signaling means 80 may be implemented by means of a communication module of a base station.
Alternatively,
the CoMP cooperative adjacent cell selected by the cooperative adjacent cell selection device comprises a same-frequency adjacent cell under another base station;
the CoMP processing device schedules downlink data of the UE in advance on a primary cell HARQ process and sends the downlink data and time-frequency resource information thereof to the same-frequency neighboring cells under the other base stations to perform CoMP downlink transmission, including:
at t0At the moment, after the downlink data of the UE is scheduled on the HARQ process of the main cell, the downlink data is cachedAccording to the downlink data and the time-frequency resource information thereof, the downlink data and the time-frequency resource information thereof are simultaneously sent to the same-frequency adjacent cell under the other base station;
at t0+tdelayAt the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource; wherein, tdelayIs the transmission delay from the local base station to the other base station.
Alternatively,
the CoMP cooperative adjacent cells selected by the cooperative adjacent cell selection device comprise K same-frequency adjacent cells under other base stations, and K is more than or equal to 2;
the CoMP processing device schedules downlink data of the UE in advance on a primary cell HARQ process and sends the downlink data and time-frequency resource information thereof to the same-frequency neighboring cells under the other base stations to perform CoMP downlink transmission, including:
determining the transmission time delay t from the base station to the base stations of the K same-frequency adjacent cellsdelay(i) Maximum value of (1)delay-maxWherein, tdelay(i) The transmission delay from the base station to the base station of the ith co-frequency adjacent cell is 1, 2.
At t0At the moment, after downlink data of the UE is scheduled on a HARQ process of a main cell, the downlink data is cached, and simultaneously the downlink data, time-frequency resources thereof and information of sending time are sent to the K same-frequency adjacent cells, wherein the sending time t istransmit＝t0+tdelay-max；
At ttransmitAnd at the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource.
Alternatively,
the CoMP cooperative adjacent cells selected by the cooperative adjacent cell selection device comprise K same-frequency adjacent cells under other base stations, and K is more than or equal to 2;
the CoMP processing device schedules downlink data of the UE in advance on a primary cell HARQ process and sends the downlink data and time-frequency resource information thereof to the same-frequency neighboring cells under the other base stations to perform CoMP downlink transmission, including:
determining the K same-frequency neighbors from the base stationTransmission time delay t of base station to which zone belongsdelay(i) Maximum value of (1)delay-maxWherein, tdelay(i) The transmission delay from the base station to the base station of the ith co-frequency neighboring cell in the K co-frequency neighboring cells is 1, 2.
At t0At the moment, after the downlink data of the UE is scheduled on the HARQ process of the main cell, the downlink data is cached, and the time t is0+(tdelay-max-tdelay(i) The downlink data and the time-frequency resource information thereof are sent to the ith same-frequency adjacent cell at the moment;
at t0+tdelay-maxAnd at the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource.
Alternatively,
the signaling sending device is further configured to send cross-carrier downlink control information to a CA secondary carrier, which is used for CA primary carrier data transmission in the HARQ process, through a physical downlink control channel of the primary carrier when CoMP downlink transmission is performed.
The following is a description with several application examples.
Example 1
In this example, the different-frequency neighboring cells are covered by the same frequency, and the same-frequency neighboring cells are macro stations. The transmission time delay of the local base station and the adjacent base station is measured and stored in the local base station.
The method for realizing CoMP downlink transmission between base stations in the present example includes:
the method comprises the following steps: when the UE supporting the CA moves to the edge of the main cell, the UE reports the RSRP of the main cell and the adjacent cells with the same frequency through A3;
step two: the base station judges that the UE performs downlink transmission in a CoMP mode, and informs the UE that the HARQ process of the unused CA auxiliary carrier is used for data transmission of the CA main carrier;
since the UE is located at the edge of the inter-frequency neighboring cell, the channel quality is poor. Before notifying the UE that the HARQ process of the unused CA secondary carrier is used for data transmission of the CA primary carrier, the base station may first notify the UE through an air interface that the CA function is no longer enabled, so that all the HARQ processes of the secondary carriers supported by the UE can be used by the primary cell.
Step three: determining the maximum transmission time delay T between base stations which can be supported by the UE according to the RTT of the unused CA auxiliary carrier wave of the UEDELAY-MAX；
Step four: traversing all reported same-frequency neighboring cells of the UE, acquiring the transmission delay from the base station to which the base station belongs, and enabling the transmission delay to be less than or equal to TDELAY-MAXForming a CoMP candidate adjacent cell set by the same-frequency adjacent cells;
the same-frequency neighboring cells of the CoMP candidate neighboring cell set can be sorted in the order of interference with the primary cell from large to small. The interference with the main cell can be represented by the difference value of the RSRP of the same-frequency adjacent cell and the RSRP of the main cell.
Step five: taking a first sequence neighbor area (under other base stations) in the CoMP candidate neighbor area set as a CoMP cooperative neighbor area;
step six: enabling CoMP techniques: and the main cell sends downlink data and time frequency resource information thereof to the cooperative adjacent cell in advance, the cooperative adjacent cell stops scheduling the data of the main cell on the time frequency resource, and the main cell and the cooperative adjacent cell send the downlink data on the same time frequency resource.
In other examples, a plurality of co-frequency neighboring cells may also be selected as the cooperative neighboring cells for interference cancellation.
Example two
In this example, the different-frequency neighboring cells are covered simultaneously, and the same-frequency neighboring cells are micro-stations (heterogeneous networks). The transmission time delay of the local base station and the adjacent base station is measured and stored in the local base station.
The method for realizing CoMP downlink transmission between base stations in the present example includes:
the method comprises the following steps: when the UE supporting the CA moves to the coverage of the co-frequency microcell, the UE reports the RSRP of the main cell and the co-frequency adjacent cell through A3;
step two: the quality of the UE located in the pilot frequency adjacent cell can meet CA; the base station judges that the UE adopts a CoMP mode to perform downlink transmission, and informs the UE of using an HARQ process of an unused CA auxiliary carrier for main carrier data transmission through an air interface;
step three: determining the maximum transmission time delay T between base stations which can be supported by the UE according to the RTT of the unused CA auxiliary carrier wave of the UEDELAY-MAX。
The following steps are the same as the steps four to six of the example one.
The scheme can realize CoMP downlink transmission among the base stations and does not influence the HARQ scheduling of the UE. The method can effectively eliminate the same frequency interference, and improve the throughput of the user and the utilization rate of the whole network spectrum.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the embodiments of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (20)

1. A method for determining maximum transmission delay between base stations supported by User Equipment (UE) comprises the following steps:
for UE supporting carrier aggregation CA and judging downlink transmission in a coordinated multi-point CoMP mode, a base station determines the use state of a CA auxiliary carrier supported by the UE, wherein the use state is in use or not in use;
and the base station takes the sum of RTTs of the CA auxiliary carriers which are not used by the UE as the maximum transmission time delay between the base stations supported by the UE.
2. The method of claim 1, wherein:
the base station uses the sum of the RTTs of the CA secondary carriers not used by the UE as the maximum transmission delay between the base stations supported by the UE, and includes:
calculating the maximum transmission time delay T between the base stations supported by the UE according to the following formulaDELAY-MAX：
TDELAY-MAX＝TRTT*(NMAX_CC-NCFG_CC)
Wherein, TRTTAn RTT for each CA secondary carrier supported by the UE; n is a radical ofMAX_CCThe maximum number of the CA auxiliary carriers supported by the UE; n is a radical ofCFG_CCThe number of the CA auxiliary carriers used by the UE.
3. A method for selecting a coordinated multi-point (CoMP) coordinated neighbor cell comprises the following steps:
the method of claim 1 or 2, wherein the base station determines the maximum transmission delay T between base stations which support carrier aggregation CA and determine UE support for downlink transmission in CoMP modeDELAY-MAX；
The base station selects one or more same-frequency adjacent cells as CoMP cooperative adjacent cells from the same-frequency adjacent cells of which the UE meets the time delay condition; wherein, the time delay condition is that the transmission time delay from the base station to the base station of the same-frequency adjacent region is less than or equal to TDELAY-MAX。
4. The method of claim 3, wherein:
and the transmission time delay from the base station to which the same-frequency adjacent region belongs is obtained by pre-measurement and stored in the base station.
5. The method of claim 3 or 4, wherein:
the base station selects one or more same-frequency adjacent cells as CoMP cooperation adjacent cells from the same-frequency adjacent cells of which the UE meets the time delay condition, and the method comprises the following steps:
and the base station selects one or more same-frequency adjacent cells with the maximum interference with the main cell from the same-frequency adjacent cells of which the UE meets the time delay condition as CoMP cooperative adjacent cells.
6. A method for realizing multi-point coordinated CoMP downlink transmission among base stations comprises the following steps:
a base station sends a signaling to UE which supports carrier aggregation CA and judges to adopt a CoMP mode to carry out downlink transmission, and the UE is indicated to use a hybrid automatic repeat request HARQ process of unused CA auxiliary carriers for CA main carrier data transmission;
the base station determines a CoMP cooperative neighboring cell of the UE according to the method of claim 3, 4 or 5;
and when the CoMP cooperative neighboring cells comprise the same-frequency neighboring cells under other base stations, the base station schedules the downlink data of the UE in advance on the HARQ process of the main cell and sends the downlink data and the time-frequency resource information thereof to the same-frequency neighboring cells under other base stations for CoMP downlink transmission.
7. The method of claim 6, wherein:
the determined CoMP cooperative adjacent cell comprises a same-frequency adjacent cell under another base station;
the base station schedules downlink data of the UE in advance on a main cell HARQ process and sends the downlink data and time-frequency resource information thereof to the same-frequency adjacent cells under other base stations for CoMP downlink transmission, and the method comprises the following steps:
at t0At the moment, after downlink data of the UE is scheduled on a HARQ process of a main cell, the downlink data is cached, and meanwhile, the downlink data and time-frequency resource information thereof are sent to the same-frequency adjacent cell under the other base station;
at t0+tdelayAt the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource; wherein, tdelayIs the transmission delay from the local base station to the other base station.
8. The method of claim 6, wherein:
the determined CoMP cooperative adjacent cells comprise K same-frequency adjacent cells under other base stations, and K is more than or equal to 2;
the base station schedules downlink data of the UE in advance on a main cell HARQ process and sends the downlink data and time-frequency resource information thereof to the same-frequency adjacent cells under other base stations for CoMP downlink transmission, and the method comprises the following steps:
determining the transmission time delay t from the base station to the base stations of the K same-frequency adjacent cellsdelay(i) Maximum value of (1)delay-maxWherein, tdelay(i) The transmission delay from the base station to the base station of the ith co-frequency adjacent cell is 1, 2.
At t0At the moment, after downlink data of the UE is scheduled on a HARQ process of a main cell, the downlink data is cached, and simultaneously the downlink data, time-frequency resources thereof and information of sending time are sent to the K same-frequency adjacent cells, wherein the sending time t istransmit＝t0+tdelay-max；
At ttransmitAnd at the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource.
9. The method of claim 6, wherein:
the determined CoMP cooperative adjacent cells comprise K same-frequency adjacent cells under other base stations, and K is more than or equal to 2;
the base station schedules downlink data of the UE in advance on a main cell HARQ process and sends the downlink data and time-frequency resource information thereof to the same-frequency adjacent cells under other base stations for CoMP downlink transmission, and the method comprises the following steps:
determining the transmission time delay t from the base station to the base stations of the K same-frequency adjacent cellsdelay(i) Maximum value of (1)delay-maxWherein, tdelay(i) The transmission delay from the base station to the base station of the ith co-frequency neighboring cell in the K co-frequency neighboring cells is 1, 2.
At t0At the moment, after the downlink data of the UE is scheduled on the HARQ process of the main cell, the downlink data is cached, and the time t is0+(tdelay-max-tdelay(i) The downlink data and the time-frequency resource information thereof are sent toThe ith same-frequency adjacent cell;
at t0+tdelay-maxAnd at the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource.
10. The method of any of claims 6-9, wherein:
the base station performs CoMP downlink transmission, including:
and the base station sends the cross-carrier downlink control information to the CA auxiliary carrier used for CA main carrier data transmission in the HARQ process through the physical downlink control channel of the main carrier.
11. A delay determining apparatus, configured to determine a maximum transmission delay between base stations supported by a user equipment UE, comprising:
an information acquisition module, configured to determine, for a UE that supports carrier aggregation CA and determines downlink transmission in a coordinated multipoint CoMP manner, a use state of a CA auxiliary carrier supported by the UE, where the use state is in use or unused;
and a delay determining module, configured to use the sum of RTTs of CA secondary carriers not used by the UE as the maximum transmission delay between base stations supported by the UE.
12. The apparatus of claim 11, wherein:
the step of using the sum of RTTs of CA secondary carriers not used by the UE as the maximum transmission delay between base stations supported by the UE includes:
calculating the maximum transmission time delay T between the base stations supported by the UE according to the following formulaDELAY-MAX：
TDELAY-MAX＝TRTT*(NMAX_CC-NCFG_CC)
Wherein, TRTTAn RTT for each CA secondary carrier supported by the UE; n is a radical ofMAX_CCThe maximum number of the CA auxiliary carriers supported by the UE; n is a radical ofCFG_CCThe number of the CA auxiliary carriers used by the UE.
13. A collaborative neighbor selection apparatus, comprising:
the delay determining apparatus according to claim 11 or 12, configured to determine the maximum transmission delay T between base stations supported by the UE that supports carrier aggregation CA and determines downlink transmission in a CoMP mannerDELAY-MAX；
The cooperative adjacent cell selection device is used for selecting one or more same-frequency adjacent cells from the same-frequency adjacent cells of which the UE meets the time delay condition as CoMP cooperative adjacent cells; the time delay condition means that the transmission time delay from the base station to the base station of the same-frequency adjacent region is less than or equal to TDELAY-MAX。
14. The apparatus of claim 13, wherein:
the collaborative neighbor cell selection apparatus further includes: the time delay storage device is used for storing the detected transmission time delay from the local base station to the adjacent base station;
and the cooperative adjacent cell selection device acquires the transmission time delay from the base station to which the same-frequency adjacent cell belongs from the time delay storage device.
15. The apparatus of claim 13 or 14, wherein:
the cooperative neighbor cell selection device selects one or more same-frequency neighbor cells as CoMP cooperative neighbor cells from the same-frequency neighbor cells of which the UE meets the time delay condition, and the method comprises the following steps: and selecting one or more same-frequency adjacent cells with the maximum interference with the main cell from the same-frequency adjacent cells of which the UE meets the time delay condition as CoMP cooperative adjacent cells.
16. A base station, comprising:
the CoMP control device is used for calling the signaling sending device and the cooperative neighbor cell selection device after judging that the UE supporting carrier aggregation performs downlink transmission in a cooperative multi-point CoMP mode; after the cooperative neighbor cell selection device returns the selected CoMP cooperative neighbor cell, calling a CoMP processing device;
collaborative neighbor selection means employing the collaborative neighbor selection means as recited in any one of claims 13-15;
a signaling sending device, configured to send a signaling to the UE, and instruct the UE to use an unused HARQ process for CA secondary carrier for CA primary carrier data transmission;
and the CoMP processing device is used for scheduling the downlink data of the UE in advance on a HARQ process of the main cell and sending the downlink data and time-frequency resource information thereof to the same-frequency adjacent cells under other base stations to perform CoMP downlink transmission when the CoMP coordinated adjacent cells comprise the same-frequency adjacent cells under other base stations.
17. The base station of claim 16, wherein:
the CoMP cooperative adjacent cell selected by the cooperative adjacent cell selection device comprises a same-frequency adjacent cell under another base station;
the CoMP processing device schedules downlink data of the UE in advance on a primary cell HARQ process and sends the downlink data and time-frequency resource information thereof to the same-frequency neighboring cells under the other base stations to perform CoMP downlink transmission, including:
at t0At the moment, after downlink data of the UE is scheduled on a HARQ process of a main cell, the downlink data is cached, and meanwhile, the downlink data and time-frequency resource information thereof are sent to the same-frequency adjacent cell under the other base station;
at t0+tdelayAt the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource; wherein, tdelayIs the transmission delay from the local base station to the other base station.
18. The base station of claim 16, wherein:
the CoMP cooperative adjacent cells selected by the cooperative adjacent cell selection device comprise K same-frequency adjacent cells under other base stations, and K is more than or equal to 2;
the CoMP processing device schedules downlink data of the UE in advance on a primary cell HARQ process and sends the downlink data and time-frequency resource information thereof to the same-frequency neighboring cells under the other base stations to perform CoMP downlink transmission, including:
determining the transmission time delay t from the base station to the base stations of the K same-frequency adjacent cellsdelay(i) Maximum value of (1)delay-maxWherein, tdelay(i) The transmission delay from the base station to the base station of the ith co-frequency adjacent cell is 1, 2.
At t0At the moment, after downlink data of the UE is scheduled on a HARQ process of a main cell, the downlink data is cached, and simultaneously the downlink data, time-frequency resources thereof and information of sending time are sent to the K same-frequency adjacent cells, wherein the sending time t istransmit＝t0+tdelay-max；
At ttransmitAnd at the moment, the main cell and all CoMP cooperative adjacent cells send the downlink data on the same time-frequency resource.
19. The base station of claim 16, wherein:
the CoMP cooperative adjacent cells selected by the cooperative adjacent cell selection device comprise K same-frequency adjacent cells under other base stations, and K is more than or equal to 2;
the CoMP processing device schedules downlink data of the UE in advance on a primary cell HARQ process and sends the downlink data and time-frequency resource information thereof to the same-frequency neighboring cells under the other base stations to perform CoMP downlink transmission, including:
determining the transmission time delay t from the base station to the base stations of the K same-frequency adjacent cellsdelay(i) Maximum value of (1)delay-maxWherein, tdelay(i) The transmission delay from the base station to the base station of the ith co-frequency neighboring cell in the K co-frequency neighboring cells is 1, 2.
At t0At the moment, after the downlink data of the UE is scheduled on the HARQ process of the main cell, the downlink data is cached, and the time t is0+(tdelay-max-tdelay(i) The downlink data and the time-frequency resource information thereof are sent to the ith same-frequency adjacent cell at the moment;
at t0+tdelay-maxAt the moment, the main cell is the same as all CoMP cooperative neighbor cellsAnd transmitting the downlink data on the frequency resources.
20. A base station according to any of claims 16-19, characterized by:
the signaling sending device is further configured to send cross-carrier downlink control information to a CA secondary carrier, which is used for CA primary carrier data transmission in the HARQ process, through a physical downlink control channel of the primary carrier when CoMP downlink transmission is performed.
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