CN101610557B - Method for dispatching terminals among wireless nodes - Google Patents
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Abstract
The invention discloses a method for dispatching terminals among wireless nodes, comprising the following steps: a network acquires the terminals and channel parameters among a group of predetermined wireless nodes of a plurality of wireless nodes; the network selects wireless nodes which establish communication links with the terminals from the group of wireless nodes according to a predetermined optimization principle; and the network sends dispatching orders to the terminals to dispatch the terminals to the selected wireless nodes. The invention can enhance the transmission speed and the frequency spectrum efficiency of a terminal positioned in an area margin, restrain the interference of an adjacent area and enhance the system throughput and can also ensure that the wireless nodes forming a layered framework are dynamically relatively complemented in space covering.
Description
Technical field
The present invention relates to the communications field, and especially, relate to a kind of method in dispatching terminals among wireless nodes.
Background technology
High speed uplink packet in the third generation (3G) system inserts (High-Speed UplinkPacket Access; HSUPA) and high speed downlink packet insert (High-Speed DownlinkPacket Access; HSDPA) in the design; In order to utilize the diversity gain between the user to improve the throughput of sub-district, adopted the dispatching technique of implementing by Node B.Business based on Node B scheduling is called dispatching services, and dispatching services is divided into the professional and descending scheduling business of uplink scheduling.
In the implementation process of uplink scheduling business, UE is before the transmission data, earlier through inserting ascending control channel (E-RUCCH at random; Abbreviate E-DCH as) channel transmission dispatch request; As shown in Figure 1, Node B is subscriber equipment (User Equipment abbreviates UE an as) Resources allocation according to the dispatch request of UE and the resource situation of sub-district; And at time point 101 resource (comprising code channel, time slot, power) of authorizing is sent to UE through E-AGCH (E-DCH absolute grant channel) channel; Issue a power control instruction simultaneously, that is, and power control data (Transmission Power Control; TPC), the power of controlling enhanced uplink physical channel (E-PUCH) transmission next time goes up and down.For a Transmission Time Interval; The each scheduling of Node B only issues a power control instruction through E-DCH absolute grant channel (E-AGCH); Time division duplex (Time Division Duplex, TDD) system is the frame length (or subframe lengths) that the TDD system adopts, for example 5ms in a kind of possible minimum transfer time interval; Another kind of possible Transmission Time Interval is the integral multiple of the frame length (or subframe lengths) of TDD system employing, like 20ms.In the moment 102, UE sends data through the E-PUCH channel, and in 103 end data transmission constantly.
Receive the E-PUCH channel data of UE as Node B after; The physical layer of NodeB is decoded, and decoded information is fed back to upper strata MAC-e (enhancing medium access control entity) entity, is responsible for producing ACK by the MAC-e entity and (confirms; Also can be described as correctly and reply) or NACK (do not confirm; Also can be described as wrong responses) indication, and on E-HICH (E-DCH hybrid automatic repeat request indication channel) channel, indication is sent to UE, after UE receives ACK; Can abandon original grouping, carry out the transmission of new data; If that receive is NACK, need to wait for that authorization resources retransmits again.
The timing relationship of dispatching services is as shown in Figure 1; Wherein, after UE receives the E-AGCH authorization message, behind timing T1, send data; Behind timing T2,104 receiving that the mixing of Node B retransmits (HARQ) indication automatically constantly after sending data; If that receive is NACK, UE will wait for absolute grant arrive after again at 105 data retransmissions constantly, the stand-by period is T3; If that receive is ACK, UE will abandon this data block, empty relevant HARQ process, wait for authorizing next time and carry out the transmission of new data again.Wherein, T1, T2 have clear and definite timing relationship, and T3 is variable, depend on the scheduling of Node B.
At application number is that CN200310109044, name are called the patent of " method of the realization dynamic fast dispatch of a kind of HSDPA of being used for system ", discloses to comprise: the number of confirming active user; Confirm that which user is active user; For active user distributes spendable code source.The number of above-mentioned active user is confirmed according to the fiducial value by all active user numbers of scheduling strategy decision is connected the user with all average channel quality, and is confirmed that according to transmission priority of each connection user which user is an active user.Then, tentatively distribute for each active user earlier, and be restrictive condition, reach maximum to guarantee the minimum information speed that all active users can transmit with the recommendation that is no more than active user by water-filling.Method in the realization dynamic fast dispatch that is used for the HSDPA system according to the present invention; Resource-sharing mode according to instantaneous channel conditions and code division multiplexing; Made full use of limited code source, when taking into account throughput of system and fairness, dynamically distributed time domain and sign indicating number territory resource for each user of HSDPA.
Can find out; Existing dispatching method is the Radio Resource that between a plurality of users, distributes same radio node; Utilize a plurality of users that the diversity gain between a plurality of users is obtained in the dynamic change of the channel quality of same radio node; But this mode can't utilize a terminal that the channel difference of different nodes is obtained the terminal at a plurality of internodal diversity gains, and has the low problem of edge cell transmission rate.
Summary of the invention
Consider the problems referred to above and make the present invention; For this reason; Main purpose of the present invention is to provide a kind of scheme in dispatching terminals among wireless nodes; Can't utilize a terminal low to solve in the correlation technique at a plurality of internodal diversity gains and cell edge terminal communication spectrum efficiency, and the big shortcoming of handover delay that handoff technique exists between off-set layer, thereby realize the dynamic complementation between the interlayer radio node.
According to embodiments of the invention, a kind of method in dispatching terminals among wireless nodes is provided, be applied to comprise the cordless communication network at a plurality of radio nodes and at least one terminal.
This method comprises: network obtains the channel parameter between the one group of predetermined radio node in terminal and a plurality of radio node; Network based predetermined optimization principle, the radio node of communication link is set up at selection and terminal from one group of radio node; Network sends dispatch command to the terminal, with terminal scheduling to selected radio node.
Wherein, the network processing of obtaining the channel parameter between one group of radio node and the terminal comprise following one of at least:
Network is measured to the channel detection signal of its transmission the terminal, obtains the channel parameter at one group of radio node and terminal;
A plurality of radio nodes are respectively to its region covered transmitting channel detectable signal, and the channel detection signal that send radio node at the terminal is measured and by rights with the reporting measuring result network.
And the channel detection signal that radio node sends to its overlay area is one group of one group of pseudo random sequence that transmitting antenna is corresponding and orthogonal one by one that is comprised with this radio node.
Wherein, the terminal is through receiving the measurement of pseudo random sequence to it, obtains the channel parameter between one group of antenna that terminal antenna and radio node comprise.
In addition, above-mentioned channel parameter comprise following one of at least: a plurality of antennas on the channel impulse response of the many single-input single-output system (SISO system)s that constitute between individual antenna on the channel impulse response of the single-input single-output system that constitutes between the individual antenna on the individual antenna on channel quality designation data, the terminal and each radio node or signal interference ratio, the terminal and a plurality of antennas on each radio node or single input multiple output system or one group of signal interference ratio, the terminal and channel impulse response or one group of signal interference ratio of the multi-input multi-output system that a plurality of antenna constituted on each radio node.
In addition, predetermined optimization principle is one of following: signal interference ratio optimization principles, presence of intercell interference suppress optimization principles.
Wherein, under situation about selecting according to the signal interference ratio optimization principles, the processing of selecting to set up the radio node of communication link with the terminal is specially:
Select signal interference ratio the highest or set up communication link with the terminal according to channel parameter with a strongest radio node of the channel impulse response of terminal room, perhaps select signal interference ratio is the highest or channel impulse response is the strongest radio node and signal interference ratio greater than predetermined value or channel impulse response intensity greater than other radio node of predetermined value jointly and the terminal set up communication link.
In addition, under situation about selecting according to presence of intercell interference inhibition optimization principles, the processing of selecting to set up the radio node of communication link with the terminal is specially:
According to channel parameter, network from a plurality of radio nodes, select and the terminal between path loss values be a minimum radio node, and from a plurality of radio nodes, select further and the terminal between path loss values be the second little radio node; With the path loss values of the second little path loss values, obtain path loss ratio divided by minimum; Path loss ratio and predetermined interference inhibition thresholding are compared, if path loss ratio suppresses thresholding greater than predetermined interference, are on the radio node of minimum to path loss values with terminal scheduling then.
Wherein, the mode of obtaining path loss is one of following mode:
The channel detection signal of measuring terminals emission is at the power at a plurality of radio nodes place respectively for a plurality of radio nodes, and to combine terminal to report or network be the transmit power parameter of terminal appointment, calculates path loss;
Channel detection signal or the reference signal or the antenna identification signal of a plurality of radio node emissions measured at the terminal; Obtain the performance number of the signal of terminal transmission at the terminal antenna place; The transmit power parameter that the terminal utilizes network to issue is obtained path loss, and path loss values is reported network.
In addition, above-mentioned a plurality of radio nodes comprise: time division duplex wireless node and/or frequency-division duplex wireless node, and wherein, the time division duplex wireless node is used to cover Microcell, and the frequency-division duplex wireless node is used to cover macrocell.
Preferably, network comprises one of following mode to the mode of terminal transmission dispatch command:
In the individual layer wireless access network that is made up of a plurality of radio nodes, network issues dispatch command through the control channel on the node of the Serving cell at place, terminal to the terminal;
In the layering wireless access network that is made up of a plurality of radio nodes, network issues dispatch command through the control channel on the frequency-division duplex wireless node in the macrocell layer to the terminal.
And, in the dispatch command in the following information of portability one of at least: the identifier, terminal that will set up the radio node of communication link with the terminal will with the terminal set up communication link radio node on the temporal frequency resource location, the mode of operation at terminal that use.
Through technique scheme of the present invention; Can improve the transmission rate and the spectrum efficiency at the terminal that is positioned at cell edge; Suppress adjacent area interference, improve throughput of system, and can let between the radio node that constitutes layer architecture dynamically complementary on the space covers.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is a sketch map of realizing dispatching services in the correlation technique;
Fig. 2 is the flow chart in the method for dispatching terminals among wireless nodes according to the inventive method embodiment;
Fig. 3 dispatches sketch map between the multinode in the individual layer wireless access network according to the embodiment of the invention in the processing instance 1 of the method for dispatching terminals among wireless nodes;
Fig. 4 between multinode dispatches sketch map in the layer in the double layered wireless access network according to the embodiment of the invention in the processing instance 2 of the method for dispatching terminals among wireless nodes;
Fig. 5 between interlayer multinode dispatches sketch map in the double layered wireless access network according to the embodiment of the invention in the processing instance 3 of the method for dispatching terminals among wireless nodes.
Embodiment
Because when being in the edge, minizone at the terminal; The channel quality of terminal to a different radio node dynamically changes; If in these adjacent nodes, have the node of preferred channels to set up communication link between selection and the terminal, just can improve throughput of system and the transmission rate that improves the terminal that is positioned at cell edge by itself and terminal.
The present invention utilizes the diversity gain of same user on the different radio node, that is, diversity gain improves throughput of system and the transmission rate that improves the terminal that is positioned at cell edge between multinode.To combine accompanying drawing to describe embodiments of the invention below.
In an embodiment of the present invention, a kind of method in dispatching terminals among wireless nodes is provided, has been applied to comprise the cordless communication network at a plurality of radio nodes and terminal.
As shown in Figure 2, comprise according to the method in dispatching terminals among wireless nodes of the embodiment of the invention: step S202, network obtain the channel parameter between the one group of predetermined radio node in terminal and a plurality of radio node; Step S204, network based predetermined optimization principle, the radio node of communication link is set up at selection and terminal from one group of radio node; Step S206, network sends dispatch command to the terminal, with terminal scheduling to selected radio node.
Wherein, one group of predetermined radio node is meant the radio node of sub-district, place, network based terminal and one group of radio node that the neighbouring relations between other radio node are confirmed among the step S202.When needing the terminal that transmitting of one group of predetermined radio node measured; Network passes through identifier and the relevant parameter of air interface with this group node, for example, and synchronous code, frequency position etc.; Be handed down to the terminal, so that the terminal is searched for and measured this group radio node.When network was measured the channel detection signal of terminal emission, network was directly controlled the channel detection signal that the radio node that has neighbouring relations between the radio node of this group node and sub-district, place, terminal launches the terminal and is carried out synchro measure.And, said here time synchronized and the Frequency Synchronization of being meant synchronously.
Particularly, in step S202, the processing that network obtains the channel parameter between one group of radio node and the terminal comprise following one of at least:
Network is measured to the channel detection signal of its transmission the terminal, obtains the channel parameter at one group of radio node and terminal;
A plurality of radio nodes are respectively to its region covered transmitting channel detectable signal, and the channel detection signal that send radio node at the terminal is measured and by rights with the reporting measuring result network.
Particularly, radio node is one group of one group of pseudo random sequence that transmitting antenna is corresponding and orthogonal one by one that is comprised with this radio node to the channel detection signal of its overlay area transmission.
Then, the terminal is through receiving the measurement of pseudo random sequence to it, obtains the channel parameter between one group of antenna that terminal antenna and radio node comprise.
Particularly, the pseudo random sequence as the antenna recognition sequence of antenna emission can be searched for, caught in the terminal; Afterwards, the channel parameter between terminal and radio node can be estimated according to the pseudo random sequence that a winding is received in the terminal.
In addition; Channel parameter comprise following one of at least: the channel quality designation data (channelquality indication, CQI), a plurality of antennas on the channel impulse response of many single-input single-output system (SISO system)s of constituting between the individual antenna on the channel impulse response of the single-input single-output system that constitutes between the individual antenna on the individual antenna on the terminal and each radio node or signal interference ratio, the terminal and a plurality of antennas on each radio node or single input multiple output system or one group of signal interference ratio, the terminal and channel impulse response or one group of signal interference ratio of the multi-input multi-output system that a plurality of antenna constituted on each radio node.
And, under this antenna configurations, can be according to the different working pattern, for example,, from the channel detection signal, estimate channel signal interference ratio in the cards according to different merge algorithms or different transmission mode etc. when empty.
In addition, under this antenna configurations, can also be according to the different working pattern, for example,, from the channel detection signal, estimate the path loss of terminal to each radio node according to different merge algorithms or different transmission mode etc. when empty.
In addition, above-mentioned predetermined optimization principle is one of following: signal interference ratio optimization principles, presence of intercell interference suppress optimization principles.
And; Under situation about selecting according to the signal interference ratio optimization principles; The processing of selecting to set up the radio node of communication link with the terminal is specially: select signal interference ratio the highest or set up communication link with the terminal according to channel parameter with a strongest radio node of the channel impulse response of terminal room, perhaps select signal interference ratio is the highest or channel impulse response is the strongest radio node and signal interference ratio greater than predetermined value or channel impulse response intensity greater than other radio node of predetermined value jointly and the terminal set up communication link.
And; When a radio node comprises a plurality of antenna; With the mean value of the signal interference ratio of different antennae on terminal antenna to the radio node, perhaps with the mean value of the channel impulse response of different antennae on terminal antenna to the radio node as the decision parameter of selecting radio node.
On the other hand, under situation about selecting according to presence of intercell interference inhibition optimization principles, the processing of selecting to set up the radio node of communication link with the terminal is specially:
According to channel parameter; Network from a plurality of radio nodes, select and the terminal between path loss values be a minimum radio node; And from a plurality of radio nodes, select further and the terminal between path loss values be the second little radio node, the approach that obtains path loss can be one of following mode:
Mode 1: the channel detection signal of measuring terminals emission is at the power at radio node place respectively for a plurality of radio nodes, and combining the perhaps network of terminal to report is the transmit power parameter of terminal appointment, calculates path loss;
Mode 2: the terminal measure the emission of a plurality of radio nodes the channel detection signal or and reference signal or antenna identification signal; Obtain a kind of performance number of these signals at the terminal antenna place; The transmit power parameter that the terminal utilizes network to issue again; Calculate path loss, and path loss values is reported network.
And in order to make the path loss of measuring embody the effect of channel small scale decline, when measuring, in the each measurement sampling time interval to signal, the space correlation change in location between terminal and the radio node antenna is less than half wavelength;
Then, network obtains a path loss ratio with the path loss values of the second little path loss values divided by minimum; Path loss ratio and predetermined interference inhibition thresholding are compared; If path loss ratio suppresses thresholding greater than predetermined interference; Be on the radio node of minimum to path loss values then with terminal scheduling; Otherwise just refusal is with on any radio node of terminal scheduling in a plurality of radio nodes.
In the middle of practical application, alternatively, all be under the situation of single antenna at terminal and base station, a kind of method of path loss of the antenna that calculates each radio node and terminal is: the power that measurements and calculations unit's transmitting power is received at receiving terminal;
And a side or two ends are arranged in terminal and base station is under the situation of many antennas; A kind of each radio node that calculates with the method for the path loss of the antenna at terminal is: the maximum in the channel path loss between the different dual-mode antennas of measurements and calculations; That is, measure the power that the unit transmitting power is received at receiving terminal between the different dual-mode antennas of calculating; In this case; Another kind of each radio node that calculates with the method for the path loss of the antenna at terminal is: the mean value in the channel path loss between the different dual-mode antennas of measurements and calculations; That is, measure to calculate the mean value of the power that unit transmitting power between the different dual-mode antennas is received at receiving terminal.
In addition, a plurality of radio nodes can comprise: (wherein, the TDD radio node is used to cover Microcell for Frequency Division Duplex, FDD) radio node, and the FDD radio node is used to cover macrocell for TDD radio node and/or FDD.That is to say that above-mentioned a plurality of radio nodes can all be formed, perhaps all formed, perhaps are made up of FDD radio node and TDD radio node by the FDD radio node that is used for the macrocell covering by the TDD radio node that is used for the Microcell covering.
Preferably, carry in the above-mentioned dispatch command in the following information one of at least: the identifier (quantity of radio node can for one or more), terminal that will set up the radio node of communication link with the terminal will with the terminal set up communication link radio node on the temporal frequency resource location, the mode of operation at terminal that use.
Like this, the terminal can on the TDD frequency range to one group of TDD node transmitting channel detectable signal or terminal can on the FDD frequency range to one group of FDD node transmitting channel detectable signal or terminal respectively on TDD frequency range and FDD frequency range to one group of TDD node and one group of FDD node transmitting channel detectable signal.
Preferably, radio node of the present invention can comprise a kind of of following form or wherein two kinds combination: the single-antenna wireless node; The multi-antenna wireless node.
Wireless terminal of the present invention can comprise a kind of of following form or wherein two kinds combination: the single-antenna wireless terminal; The multi-antenna wireless terminal.
In the middle of practical application, the terminal of network based acquisition and the channel impulse response data between radio node, control terminal is work one of as follows:
When the channel impulse response rank of matrix between the antenna of a terminal antenna and a radio node is 1, perhaps transmit data with single-shot list receipts between network control radio node and the terminal with the mode of beam shaping;
When the channel impulse response rank of matrix between the antenna of a terminal antenna and a radio node is during greater than 1 integer, between network control radio node and the terminal with the mode of space diversity or transmit data with the mode of spatial reuse.
Alternatively, network comprises one of following mode to the mode of terminal transmission dispatch command:
In the individual layer wireless access network that is made up of a plurality of radio nodes, network issues dispatch command through the control channel on the node of the Serving cell at place, terminal to the terminal;
In the layering wireless access network that is made up of a plurality of radio nodes, network issues dispatch command through the control channel on the frequency-division duplex wireless node in the macrocell layer to the terminal.
Particularly, can adopt following two kinds of scheduling modes: dispatch the terminal (1) between the node with one deck, for example, dispatches belonging between the TDD node of microcell level, can let the terminal set up communication link with a plurality of TDD nodes simultaneously; (2) terminal is dispatched between the node with different layers; For example; Between the TDD node of FDD node that belongs to macrocell layer and microcell level, dispatch, can let the terminal between TDD node and FDD node, carry out the quick conversion (switch) of Traffic Channel, also can let the terminal set up communication link with FDD node and TDD node simultaneously with the mode of time-division; For example, network uses Traffic Channel and the Traffic Channel on the FDD and terminal on the TDD radio node to communicate simultaneously.
In addition, when the channel impulse response rank of matrix between the antenna of terminal antenna and two or more radio node is 1, perhaps transmit data with single-shot list receipts between network control radio node and the terminal with the mode of beam shaping;
When the channel impulse response rank of matrix between terminal antenna and two or more the radio node antenna is during greater than 1 integer, between network control radio node and the terminal with the mode of space diversity or transmit data with the mode of spatial reuse.
To combine instantiation to describe the present invention below.
Instance 1
In distributed base station shown in Figure 3, comprising: Base-Band Processing and 301,4 remote radio unit (RRU)s of control unit (radio node) 302,303,304,305.Remote radio unit (RRU) 302,303,304,305 is coverage cell 302a, 303a, 304a, 305a respectively.
Wherein, Base-Band Processing and control unit 301 are used to accomplish following function: two-way communication is carried out through optical fiber link and 4 remote radio unit (RRU)s 302,303,304,305 in (1); (2) to from carrying out Base-Band Processing, comprising: (a) a plurality of far end radio frequencies are led the channel detection signal of sending out on the terminal that the unit receives and handle with the signal that mails to remote radio unit (RRU); The antenna recognition sequence that is used for channel detection that (b) need send each antenna in the remote radio unit (RRU) carries out Base-Band Processing; (3) the needed processing of scheduling between node is carried out at the terminal, comprised optimizing the radio node of setting up communication link with the terminal, and the resource on the terminal distribution radio node.
Remote radio unit (RRU) 302,303,304,305 is worked with TDD (time division duplex) mode, and remote radio unit (RRU) 302,303,304,305 all comprises interface, radio-frequency module and the antenna that communicates with Base-Band Processing and control unit 301.Keep synchronized relation in time between the radio frames that this group radio frequency unit is launched.
Under the situation of above-mentioned base station configuration and terminal capability, Base-Band Processing and control unit 301 are following in the processing of a plurality of dispatching terminals among wireless nodes 306:
Step (1): network obtains the channel parameter between terminal itself and one group of radio node; Comprise following concrete steps: the terminal is to network transmitting channel detectable signal, and this signal is received by remote radio unit (RRU) (radio node) 302,303,304, and is sent to Base-Band Processing and control unit 301 is handled.
Base-Band Processing and control unit 301 carry out following a kind of processing at least: the signal strength signal intensity or the signal interference ratio that 1) calculate the detectable signal of the terminal emission that remote radio unit (RRU) (radio node) 302,303,304 receives; 2) path loss between calculating remote radio unit (RRU) (radio node) 302,303,304 and the terminal; 3) calculate in remote radio unit (RRU) (radio node) 302,303,304 channel impulse response between each antenna on each antenna and terminal.With these data as the end-fire channel quality data between unit (radio node) 302,303,304 and the terminal frequently;
Step (2): network is according to predetermined optimization principles, and the channel parameter according between said terminal and one group of radio node optimizes the radio node that is used for setting up with said terminal communication link; Specifically comprise following steps: Base-Band Processing and control unit 301 are according to intensity or the signal interference ratio of detectable signal on remote radio unit (RRU) (radio node) 302,303,304 at terminal; Select the best remote radio unit (RRU) of channel quality (radio node) 303 as in Future Time, distributing to the radio node that use at the terminal
Base-Band Processing and control unit 301 be according to the occupation condition of remote radio unit (RRU) 303, remote radio unit (RRU) (radio node) 303 can with running time-frequency resource in the some or all of terminal of distributing to use;
Step (3): network issues dispatch command between node to the terminal.
Through the control channel between terminal and the remote radio unit (RRU) 302 1. Base-Band Processing and control unit 301 send following information to the terminal: the 1) identifier of remote radio unit (RRU) 303; 2) 3. residing time slot of Traffic Channel and the resource block location on remote radio unit (RRU) 303, used of terminal.
Instance 2
In this example, need in the layered distribution type base station, carry out multinode scheduling in the layer to the terminal.
In this example, the structure of layered distribution type base station such as Fig. 4.As shown in Figure 4, this base station system comprises: Base-Band Processing and 401,5 remote radio unit (RRU)s of control unit (radio node) 402,403,404,405 and 410.Remote radio unit (RRU) 410 is used for macrocell and covers with fdd mode work, in the macrocell 410a of its covering, has the remote radio unit (RRU) 402,403,404,405 with tdd mode work, covers Microcell 402a, 403a, 404a, 405a respectively.
Base-Band Processing and control unit 401 are used to realize following function: 1) carry out two-way communication through optical fiber link and 5 remote radio unit (RRU)s 402,403,404,405 and 410; 2) to from carrying out Base-Band Processing with the signal that mails to remote radio unit (RRU); Both carried out the Base-Band Processing of tdd mode; Also carry out the Base-Band Processing of fdd mode; Comprise: the channel detection signal of sending out on the terminal that (a) a plurality of TDD remote radio unit (RRU)s is received is handled, and/or the channel detection signal of sending out on the terminal that a plurality of FDD remote radio unit (RRU)s are received is handled; The antenna recognition sequence that is used for channel detection that (b) need send each antenna in the remote radio unit (RRU) carries out Base-Band Processing; 3) the needed processing of scheduling between node is carried out at the terminal, comprised optimizing the radio node of setting up communication link with the terminal, and the resource on the terminal distribution radio node.
Remote radio unit (RRU) 402,403,404,405 all comprises interface, radio-frequency module and the antenna that communicates with Base-Band Processing and control unit 401.Keep synchronized relation in time between the radio frames that this group radio frequency unit is launched.
Remote radio unit (RRU) 410 comprises interface, radio-frequency module and the antenna that communicates with Base-Band Processing and control unit 401.Keep synchronized relation in time between the radio frames that radio frames that this radio frequency unit is launched and remote radio unit (RRU) 402,403,404,405 are launched.
Under the situation of above-mentioned base station configuration and terminal capability, Base-Band Processing and control unit 401 are following in the processing procedure of a plurality of dispatching terminals among wireless nodes 406:
Step (1): network obtains the channel parameter between terminal and one group of radio node;
Comprise following concrete steps: the microcell level transmitting channel detectable signal of terminal in hierarchical network, this signal is received by remote radio unit (RRU) (radio node) 402,403,404, and is sent to Base-Band Processing and control unit 401 is handled.
Base-Band Processing and control unit 401 carry out following a kind of processing at least: the signal strength signal intensity or the signal interference ratio that 1) calculate the detectable signal of the terminal emission that remote radio unit (RRU) (radio node) 402,403,404 receives; 2) path loss between calculating remote radio unit (RRU) (radio node) 402,403,404 and the terminal; 3) calculate in remote radio unit (RRU) (radio node) 402,403,404 channel impulse response between each antenna on each antenna and terminal.With these data as the end-fire channel quality data between unit (radio node) 402,403,404 and the terminal frequently,
Step (2): network is according to predetermined optimization principles, and the channel parameter according between said terminal and one group of radio node optimizes the radio node that is used for setting up with said terminal communication link;
Specifically comprise following steps: Base-Band Processing and control unit 401 are according to intensity or the signal interference ratio of detectable signal on remote radio unit (RRU) (radio node) 402,403,404 at terminal; Select the best remote radio unit (RRU) of channel quality (radio node) 403 as in Future Time, distributing to the radio node that use at the terminal
Base-Band Processing and control unit 401 be according to the occupation condition of remote radio unit (RRU) 403, remote radio unit (RRU) (radio node) 403 can with running time-frequency resource in the some or all of terminal of distributing to use;
Step (3): network issues dispatch command between node to the terminal.
Through the control channel between terminal and the remote radio unit (RRU) 410 1. Base-Band Processing and control unit 401 send following information to the terminal: the 1) identifier of remote radio unit (RRU) 403; 2) 3. residing time slot of Traffic Channel and the resource block location on remote radio unit (RRU) 403, used of terminal.
In this example, need in the layered distribution type base station, carry out the scheduling of interlayer multinode to the terminal.
The structure of layered distribution type base station is as shown in Figure 5, comprising: Base-Band Processing and 501,5 remote radio unit (RRU)s of control unit (radio node) 502,503,504,505 and 510.Remote radio unit (RRU) 510 is used for macrocell and covers with fdd mode work, in the macrocell 510a of its covering, has the remote radio unit (RRU) 502,503,504,505 with tdd mode work, covers Microcell 502a, 503a, 504a, 505a respectively.
Base-Band Processing and control unit 501 are used to realize following function: 1) carry out two-way communication through optical fiber link and 5 remote radio unit (RRU)s 502,503,504,505 and 510; 2) to from carrying out Base-Band Processing with the signal that mails to remote radio unit (RRU); Both carried out the Base-Band Processing of tdd mode; Also carry out the Base-Band Processing of fdd mode; Comprise: the channel detection signal of sending out on the terminal that (a) a plurality of TDD remote radio unit (RRU)s is received is handled, and/or the channel detection signal of sending out on the terminal that a plurality of FDD remote radio unit (RRU)s are received is handled; The antenna recognition sequence that is used for channel detection that (b) need send each antenna in the remote radio unit (RRU) carries out Base-Band Processing; 3) the needed processing of scheduling between node is carried out at the terminal, comprised optimizing the radio node of setting up communication link with the terminal, and the resource on the terminal distribution radio node.
Wherein, remote radio unit (RRU) 502,503,504,505 all comprises interface, radio-frequency module and the antenna that communicates with Base-Band Processing and control unit 501.Keep synchronized relation in time between the radio frames that this group radio frequency unit is launched.
And remote radio unit (RRU) 510 comprises interface, radio-frequency module and the antenna that communicates with Base-Band Processing and control unit 501.Keep synchronized relation in time between the radio frames that radio frames that this radio frequency unit is launched and remote radio unit (RRU) 502,503,504,505 are launched.
Under the situation of above-mentioned base station configuration and terminal capability, Base-Band Processing and control unit 501 are following in the processing procedure of a plurality of dispatching terminals among wireless nodes 506:
Step (1): network obtains the channel parameter between terminal and one group of radio node;
Comprise following concrete steps: the microcell level transmitting channel detectable signal of terminal in hierarchical network, this signal is received by remote radio unit (RRU) (radio node) 502,503,504, and is sent to Base-Band Processing and control unit 501 is handled; The terminal reports the channel quality information of remote radio unit (RRU) 510 to hierarchical network.
Step (2): network is according to predetermined optimization principles, and the channel parameter according between said terminal and one group of radio node optimizes the radio node that is used for setting up with said terminal communication link;
Specifically comprise following steps: Base-Band Processing and control unit 501 compare the channel quality between terminal and the remote radio unit (RRU) 510 and terminal and remote radio unit (RRU) (radio node) 502,503, channel quality between 504; Select the best remote radio unit (RRU) of channel quality 510 as in Future Time, distributing to the radio node that use at the terminal
Base-Band Processing and control unit 501 be according to the occupation condition of remote radio unit (RRU) 510, remote radio unit (RRU) 510 can with running time-frequency resource in the some or all of terminal of distributing to use;
Step (3): network issues dispatch command between node to the terminal.
Through the control channel between terminal and the remote radio unit (RRU) 510 1. Base-Band Processing and control unit 501 send following information to the terminal: the 1) identifier of remote radio unit (RRU) 510; 2) 4. residing time slot of Traffic Channel and the resource block location on remote radio unit (RRU) 510, used of terminal.
Through dispatch terminal between Microcell node and macrocell node, in the time of can having leak in the covering of Microcell node, let the macrocell node service is provided to the terminal, guarantee the covering quality of network.
In addition; Can also like far end radio frequency list 503, use to same terminal remote radio unit (RRU) that is used for macrocell 510 and the Microcell node that is used for Microcell like scheduling simultaneously; Realize the comprehensive use of terminal, thereby improve the transmission rate at terminal TDD frequency spectrum and FDD frequency spectrum.
In sum, the present invention proposes and utilize the diversity gain of same user on the different radio node, that is, the scheme of diversity gain between multinode by means of technical scheme of the present invention, can improve the transmission rate and the spectrum efficiency at the terminal that is positioned at cell edge; Through the path loss of comprehensive judgement terminal to different nodes, carry out internodal optimized dispatching, can suppress adjacent area interference, improve throughput of system; And can let between the radio node that constitutes layer architecture dynamically complementary on the space covers.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. method in dispatching terminals among wireless nodes is applied to comprise the cordless communication network at a plurality of radio nodes and at least one terminal it is characterized in that said method comprises:
Network obtains the channel parameter between the one group of predetermined radio node in said terminal and the said a plurality of radio node;
Said network based predetermined optimization principle, the radio node of communication link is set up at selection and said terminal from said one group of radio node;
Said network sends dispatch command to said terminal, with said terminal scheduling to selected radio node;
Wherein, the said network mode of sending said dispatch command to said terminal comprises one of following mode:
In the individual layer wireless access network that is made up of said a plurality of radio nodes, said network issues said dispatch command through the control channel on the node of the Serving cell at place, terminal to said terminal;
In the layering wireless access network that is made up of said a plurality of radio nodes, said network issues said dispatch command through the control channel on the frequency-division duplex wireless node in the macrocell layer to said terminal.
2. method according to claim 1 is characterized in that, the processing that said network obtains the channel parameter between said one group of radio node and the said terminal comprise following one of at least:
Said network is measured to the channel detection signal of its transmission said terminal, obtains the channel parameter at said one group of radio node and said terminal;
Said a plurality of radio node is respectively to its region covered transmitting channel detectable signal, and the channel detection signal that send radio node at the terminal is measured and by rights with the reporting measuring result network.
3. method according to claim 2 is characterized in that, the said channel detection signal that said radio node sends to its overlay area is one group of one group of pseudo random sequence that transmitting antenna is corresponding and orthogonal one by one that is comprised with this radio node.
4. method according to claim 3 is characterized in that, said terminal is through receiving the measurement of said pseudo random sequence to it, obtains the channel parameter between said one group of antenna that said terminal antenna and said radio node comprise.
5. method according to claim 1; It is characterized in that, said channel parameter comprise following one of at least: a plurality of antennas on the channel impulse response of the many single-input single-output system (SISO system)s that constitute between individual antenna on the channel impulse response of the single-input single-output system that constitutes between the individual antenna on the individual antenna on channel quality designation data, the said terminal and said each radio node or signal interference ratio, the said terminal and a plurality of antennas on said each radio node or single input multiple output system or one group of signal interference ratio, the said terminal and channel impulse response or one group of signal interference ratio of the multi-input multi-output system that a plurality of antenna constituted on said each radio node.
6. method according to claim 1 is characterized in that, said predetermined optimization principle is one of following: signal interference ratio optimization principles, presence of intercell interference suppress optimization principles.
7. method according to claim 6 is characterized in that, under situation about selecting according to said signal interference ratio optimization principles, the processing of selecting to set up the radio node of communication link with said terminal is specially:
Select signal interference ratio the highest or set up communication link according to channel parameter, perhaps select signal interference ratio is the highest or channel impulse response is the strongest radio node and signal interference ratio common and said terminal to set up communication link greater than other radio node of predetermined value greater than predetermined value or channel impulse response intensity with a strongest radio node and the said terminal of the channel impulse response of said terminal room.
8. method according to claim 6 is characterized in that, under situation about selecting according to said presence of intercell interference inhibition optimization principles, the processing of selecting to set up the radio node of communication link with said terminal is specially:
According to channel parameter; Said network from said a plurality of radio nodes, select and said terminal between path loss values be a minimum radio node, and from said a plurality of radio nodes, select further and said terminal between path loss values be the second little radio node; With the path loss values of the said second little path loss values, obtain path loss ratio divided by minimum; Said path loss ratio and predetermined interference inhibition thresholding are compared, if said path loss ratio suppresses thresholding greater than said predetermined interference, are on the radio node of minimum to said path loss values with said terminal scheduling then.
9. method according to claim 8 is characterized in that, the mode of obtaining said path loss is one of following mode:
Said a plurality of radio node is measured the power of the channel detection signal of said terminal emission at said a plurality of radio nodes place respectively, and to combine said terminal to report or said network be the transmit power parameter of said terminal appointment, calculates path loss;
Channel detection signal or the reference signal or the antenna identification signal of said a plurality of radio node emissions measured at said terminal; Obtain the performance number of the signal of said terminal transmission at said terminal antenna place; The transmit power parameter that said terminal utilizes said network to issue is obtained path loss, and path loss values is reported said network.
10. method according to claim 1; It is characterized in that said a plurality of radio nodes comprise: time division duplex wireless node and/or frequency-division duplex wireless node, wherein; Said time division duplex wireless node is used to cover Microcell, and said frequency-division duplex wireless node is used to cover macrocell.
11. method according to claim 1; It is characterized in that, carry in the said dispatch command in the following information one of at least: will with said terminal set up the identifier of the radio node of communication link, said terminal said will with said terminal set up communication link radio node on the temporal frequency resource location, the mode of operation at said terminal that use.
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| WO2011075903A1 (en) * | 2009-12-24 | 2011-06-30 | 中兴通讯股份有限公司 | Method and device for establishing service routing |
| CN102640537B (en) * | 2009-12-24 | 2015-06-03 | 中兴通讯股份有限公司 | Method and device for establishing service route |
| CN101895990B (en) | 2010-06-13 | 2013-04-24 | 华为技术有限公司 | Method, device and system for wireless access |
| CN102916732B (en) * | 2011-08-02 | 2017-10-03 | 南京中兴软件有限责任公司 | A kind of method, system and control station for realizing super cell data transfer |
| CN103249124B (en) * | 2013-04-09 | 2015-09-16 | 东南大学 | Dense distribution formula wireless communications method and system thereof |
| CN103870991B (en) * | 2014-03-14 | 2018-01-12 | 广州广电运通金融电子股份有限公司 | Self-aided terminal business emergency method and site server |
| CN105592561A (en) * | 2014-10-23 | 2016-05-18 | 中兴通讯股份有限公司 | Method and system for realizing wireless access |
| CN105792320B (en) * | 2014-12-25 | 2019-03-19 | 台达电子工业股份有限公司 | The method for establishing self-organization network of radio node |
| TWI602467B (en) * | 2015-12-01 | 2017-10-11 | Chunghwa Telecom Co Ltd | System for wireless sensing network and its wireless relay device |
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