CN101827426B - Method and device for monitoring control channel in multi-carrier system - Google Patents
Method and device for monitoring control channel in multi-carrier system Download PDFInfo
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Abstract
The invention discloses a method and a device for monitoring a control channel in a multi-carrier system, wherein in the method, a base station sends a configuration signaling to direct a terminal to continuously monitor the control channel on partial carriers or discontinuously monitor the control channel on partial or all carriers; and the terminal monitors the control channel according to the configuration signaling of the base station. The invention proposes a DRX (Discontinuous Reception) process of a frequency domain by aiming at the multi-carrier system, and can improve the electricity saving performance of the system.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of method and device of monitoring control channel in multi-carrier system.
Background technology
In the mobile communication system based on shared channel, the up-downgoing data transfer generally is responsible for control by base station (eNB) scheduler, when scheduler is determined certain user of scheduling, will in which kind of resource send or receive data by the control channel notification terminal.Terminal (UE) monitoring control channel when detecting the schedule information that comprises self, is finished the transmission (up) of data or is received (descending) according to the indication on the control channel.
Under state of activation, because when the uncertain eNB of terminal dispatch it, therefore a kind of common mode of operation is, the continuous monitoring control channel of terminal is resolved each subframe that comprises its descending scheduling control channel, is scheduled judging whether.This working method is larger in the terminal data amount, can obtain higher efficient in the situation about may frequently be dispatched.Yet professional for some, the arrival rate of data is lower, and the number of times that causes terminal to be scheduled is also less, if terminal continuous monitoring control channel still can increase its power consumption undoubtedly.
LTE-A (LTE Advanced, improved long evolving system) requires to reach descending 1Gbps, up 500Mbps.On the bandwidth of 20Mhz, can't satisfy this demand, therefore the LTE-A system has introduced carrier aggregation (Carrier Aggregation, CA) technology, be in the same residential quarter, continuous or discrete a plurality of carrier waves (being called member carrier) are concentrated in together, when needed simultaneously for the UE service, so that required speed to be provided.For the UE that guarantees LTE-A can work under the member carrier of each polymerization, each member carrier maximum is no more than 20Mhz.The CA technology of LTE-A as shown in Figure 1.In the LTE-A residential quarter shown in Figure 1, polymerization 4 member carriers.Transfer of data can be carried out with UE simultaneously in the base station on 4 member carriers, to improve throughput of system.
To use the mobile communication system of CA technology referred to as " multicarrier system " herein.At present, for multicarrier system monitoring control channel how, still there is not the feasible program of determining.
Summary of the invention
The invention provides a kind of method and device of monitoring control channel in multi-carrier system, with solve present multicarrier system how monitoring control channel do not have the problem of clear and definite scheme.
For this reason, the embodiment of the invention adopts following technical scheme:
A kind of method of monitoring control channel in multi-carrier system comprises: the base station issues configuration signal to terminal, and indicating terminal is continuous monitoring control channel on partial carrier wave, perhaps, and discontinuously monitoring control channels on part or all of carrier wave; Terminal is according to the configuration signal monitoring control channel of base station.
When indicating terminal during discontinuously monitoring control channels, also comprises on part or all of carrier wave: when overlapped the effective time of two or more carrier waves (Active time), described terminal is monitoring control channel on carrier wave therein.
Wherein, described configuration signal comprises the member carrier index; Described terminal comprises according to the process of the configuration signal monitoring control channel of base station: described terminal on carrier wave corresponding to described member carrier index, continuous monitoring control channel.
Perhaps, described configuration signal comprises member carrier index and discontinuous reception (DRX) configuration signal, and described DRX configuration signal comprises starting point, cycle and timer length; Described terminal comprises according to the process of the configuration signal monitoring control channel of base station: described terminal on carrier wave corresponding to member carrier index, monitoring control channel in the Active time that determines according to the DRX configuration signal.
The DRX configuration signal of each member carrier index has identical cycle, different starting points in the described configuration signal.
A kind of device of controlling monitoring control channel in multi-carrier system comprises: the configuration signal generation unit is used for generating configuration signal; The configuration signal transmitting element is used for described configuration signal is sent to terminal, and indicating terminal is continuous monitoring control channel on partial carrier wave, perhaps, and discontinuously monitoring control channels on part or all of carrier wave.
Wherein, the configuration signal of described configuration signal generation unit generation comprises the member carrier index; Described configuration signal transmitting element indicating terminal is continuous monitoring control channel on carrier wave corresponding to described member carrier index.
Perhaps, the configuration signal that described configuration signal generation unit generates comprises member carrier index and DRX configuration signal, and described DRX configuration signal comprises starting point, cycle and timer length; Described configuration signal transmitting element indicates described terminal on carrier wave corresponding to described member carrier index, monitoring control channel in the Active time that determines according to the DRX configuration signal.
Preferably, the DRX configuration signal of each member carrier index has identical cycle, different starting points in the configuration signal of described configuration signal generation unit generation.
A kind of device of monitoring control channel in multi-carrier system comprises: the configuration signal receiving element is used for from base station reception configuration signal; The control channel monitoring unit is used for according to described configuration signal, continuous monitoring control channel on partial carrier wave, perhaps, discontinuously monitoring control channels on part or all of carrier wave.
Preferably, also comprise: the carrier wave selected cell, when the configuration signal of configuration signal receiving element reception shows that the Active time that has two or more carrier waves overlaps, be used for therefrom selecting a carrier wave, and indicate described control channel monitoring unit monitoring control channel on selected carrier wave.
Among the present invention, terminal is continuous monitoring control channel on partial carrier wave only, perhaps, discontinuously monitoring control channels on partial carrier wave or all carrier waves, rather than on all carrier waves continuous monitoring control channel, thereby can save the electric weight of terminal.
As seen, the present invention is based on the multicarrier system of using the CA technology, proposed the DRX scheme of frequency domain, can in multicarrier system, improve the power saving performance of terminal.
Description of drawings
Fig. 1 is the LTE-A system cell carrier wave schematic diagram that prior art adopts the CA technology;
Fig. 2 is the process schematic diagram that is in the UE monitoring control channel of DRX state;
Fig. 3 is DRX process schematic diagram;
Fig. 4 is the course of work and the correlation schematic diagram of each timer among the DRX;
Fig. 5 is the method flow diagram of monitoring control channel in multi-carrier system of the present invention;
Fig. 6 is the inventive method embodiment one schematic diagram;
Fig. 7 is the inventive method embodiment two schematic diagrames 1;
Fig. 8 is the inventive method embodiment two schematic diagrames 2;
Fig. 9 is the inventive method embodiment two schematic diagrames 3;
Figure 10 be among the inventive method embodiment two on the different carrier Active time overlap schematic diagram;
Figure 11 is the apparatus structure schematic diagram that the present invention controls monitoring control channel in multi-carrier system;
Figure 12 is the apparatus structure schematic diagram of monitoring control channel in multi-carrier system of the present invention.
Embodiment
In LTE-A, can reach higher transmission rate in order to make UE, UE needs simultaneously that a plurality of even whole member carriers in the residential quarter carry out transfer of data, if according to present mechanism, UE need to be on all member carriers monitoring control channel.If UE is monitoring control channel on all carrier waves always, can waste than multi-energy undoubtedly.
In order to fully understand the embodiment of the invention, paper discontinuous reception (DiscontinuousReception, DRX) technology.
In order to solve the power consumption problem, mobile communication system has adopted the DRX mode of operation, under this mode of operation, and terminal periodic control channel is monitored, thereby reach the purpose of economize on electricity.Because a residential quarter only has a carrier wave, be in the DRX state the UE monitoring control channel process as shown in Figure 2.That is, even UE is in the DRX state, but during Active Time (effective time), still be operated in full bandwidth, namely the DRX of UE only carries out in time domain.
The process of DRX as shown in Figure 3.Wherein the time period of On duration (monitoring the duration) expression UE monitoring control channel, open the radio-frequency channel therebetween, and continuous monitoring control channel; Remove outside the On duration At All Other Times, UE is in Sleep (dormancy) state, and its radio frequency link will be closed, and monitoring control channel no longer is to reach the purpose of power saving.(Cycle) periodically appears in On Duration, and the concrete cycle is by the eNB Configuration.For specific implementation DRX operation, LTE has designed multiple timer, and in conjunction with mixed automatic retransfer request (Hybrid Automatic Repeat Request, HARQ) process, provided the operating process under the DRX state, being specifically described as follows of relevant timer.
1. On Duration Timer: the continuous several subframes that can carry Physical Downlink Control Channel (Physical Downlink Control Channel, PDCCH) that begin to count from the DRX cycle starting point.UE need monitor PDCCH during this period, distributes to look into the resource that sees if there is for this UE.If terminal receives the up-downgoing scheduling during On Duration, to start other timer and carry out follow-up scheduling process, if but terminal does not receive the up-downgoing scheduling during On Duration, will enter the sleep state, until next DRX cycle, again receive data transmission when On Duration Timer starts.
If UE receives the up-downgoing scheduling during On Duration, also may start following timer, indication UE further monitors PDCCH.
2. DRX Inactivity Timer (the inactive timer of DRX): start when receiving the PDCCH of scheduling new data, UE monitors PDCCH always between the starting period; End condition is this timer expiry or the medium access control of receiving forced termination (Media Access Control, MAC) layer signaling.
3. HARQ RTT Timer (HARQ Round Trip Timer): only for downlink transfer, start when receiving the PDCCH of dispatching downlink data, regular length passes the time interval for short weight, unless covered by other timer during this period, otherwise do not need to monitor PDCCH.
4. DRX Retransmission Timer (DRX retransmission timer): only for downlink transfer, after HRAQ RTT Timer is overtime, if front once transmission does not still have successfully decoded, then start, UE monitors PDCCH always between the starting period; End condition is this timer expiry or receives the retransfer scheduling of expectation.
Fig. 4 has provided the course of work and the correlation of above-mentioned timer.At on duration t1 therebetween constantly, eNB has dispatched the initial transmission for process 1, so UE opens Inactivity Timer and corresponding RTT Timer1.Because the decoding of the initial transmission of Process 1 is unsuccessful, after RTT Timer was overtime, UE had opened Retransmission Timer1.
In the t2 moment, eNB has dispatched the initial transmission for Process 2, and Inactivity Timer is restarted, and opens simultaneously the RTT Timer2 for Process 2.
In the t3 moment before Retransmission timer1 is overtime, UE has received the re-transmission for Process 1, then stop Retransmission Timer1, and open RTT Timer1.
After RTT Timer2 is overtime, because the initial transmission of Process 2 does not have successfully decoded, so UE opens Retransmission Timer2.In the t4 moment before Retransmission Timer2 is overtime, eNB has dispatched the re-transmission of Process 2, so UE stops Retransmission Timer2, opens RTTTimer2.
In the t5 moment before Retransmission Timer1 is overtime, eNB has continued to dispatch the re-transmission of Process 1, so Retransmission Timer1 is terminated, starts simultaneously RTT Timer1.Before RTTTimer2 was overtime, UE was to the success of the data decode among the Process 2, so to the eNB feeding back ACK, after RTT Timer2 is overtime, also do not restart Retransmission Timer2 simultaneously.Equally, before RTTTimer1 was overtime, UE was to the success of the data decode among the Process 1, so to the eNB feeding back ACK, after RTT Timer1 is overtime, also do not restart Retransmission Timer1.
Can find out in On duration Timer, Retransmission Timer and Inactivity Timer, have any one timer to move by said process, UE is with monitoring control channel.The time of UE monitoring control channel is called again Active Time.Because the effect of a plurality of timers, the time of monitoring PDCCH may be extended behind On duration, even overlaps with next On duration process.
After having introduced the DRX technology, below in conjunction with accompanying drawing, the present invention will be described in detail.
In brief, configuration UE of the present invention is only monitored partial carrier wave, namely introduces the thought of discontinuous reception at frequency domain.
Referring to Fig. 5, the method flow diagram for monitoring control channel in multi-carrier system of the present invention comprises:
S501: the base station issues configuration signal to terminal, and indicating terminal is continuous monitoring control channel on partial carrier wave, perhaps, and discontinuously monitoring control channels on part or all of carrier wave;
S502: terminal is according to the configuration signal of base station, continuous monitoring control channel on partial carrier wave, perhaps, discontinuously monitoring control channels on part or all of carrier wave.
Following embodiment is specifically arranged:
Embodiment one: UE is continuous monitoring control channel on partial carrier wave only.
Referring to Fig. 6, be embodiment one schematic diagram.Among Fig. 6, UE is continuous monitoring control channel on carrier wave 2 only, to obtain possible schedule information.When adopting this allocation plan, when UE need to be dispatched in the base station, must send control information at the member carrier that UE monitors, could be detected by UE.
In embodiment one, the base station sends the configuration signal that comprises the member carrier index to UE, indication UE monitoring control channel on which carrier wave.For example, for situation shown in Figure 6, the base station comprises " index of carrier wave 2 " in the configuration signal of UE transmission, after UE receives configuration signal, and continuous monitoring control channel on carrier wave 2.
Need to prove that for embodiment one, different UE can be configured to monitor different carrier waves, for example, for Fig. 6, the base station can dispose two UE (UE1 and UE2) respectively monitoring carrier wave 1 and carrier wave 2; And same UE also can monitor more than a carrier wave, for example, for Fig. 6, for certain UE, can dispose simultaneously monitoring carrier wave 1 and carrier wave 2.
Embodiment two, and UE is discontinuously monitoring control channels on part or all of carrier wave.
Embodiment two introduces DRX thought, and possible several implementations are described below.
(1) UE discontinuously monitoring control channels on partial carrier wave.
This wherein comprises again two kinds of situations at least:
(1.1) UE discontinuously monitoring control channels on a carrier wave only.
Referring to Fig. 7, UE is discontinuously monitoring control channels on carrier wave 2 only, to obtain possible schedule information.From the angle of a carrier wave, this mode is identical with DRX process among the LTE, but the base station need to be specified UE monitoring control channel on which member carrier in advance.
Similar with embodiment one, in this scheme, different UE can be configured to monitor different carrier waves, and for example, for Fig. 7, the base station can dispose two UE (UE1 and UE2) respectively monitoring carrier wave 1 and carrier wave 2.
(1.2) UE (non-all carrier waves) discontinuously monitoring control channels on more than a carrier wave.
Referring to Fig. 8, UE is discontinuously monitoring control channels on carrier wave 1 and 2, to obtain possible schedule information.Process on a carrier wave is identical with DRX process among the LTE.Different UE can be configured to monitor different carrier combination.
Compare with (1.1), (1.2) this scheme needs UE simultaneously or monitoring control channel on more than a member carrier of non-while.The base station can such as the channel difference between the member carrier, load etc., be selected between the member carrier that UE monitors according to some factors when scheduling UE, namely provides greater flexibility to the base station.
Why this scheme can provide greater flexibility to the base station, and reason is:
After adopting the CA technology, if UE only is configured to continuous or discontinuous monitoring PDCCH on a carrier wave, so according to the standard of existing LTE, UE can only feed back the CQI (channel quality) of monitored carrier wave during Active time, the base station is when scheduling, because can only obtain the CQI of a carrier wave, so can't dispatch at the better carrier wave of other CQI.If a plurality of carrier waves of the continuous or discontinuous monitoring of configuration UE, during Active time, the base station can obtain the CQI on a plurality of carrier waves so.When really needing scheduling, the base station can have between a plurality of carrier waves of CQI information, selects CQI to carry out preferably transfer of data.Equally, because the load of different carrier also is different, UE monitors a plurality of carrier waves, and when base station scheduling, the lighter carrier wave of can selecting to load is dispatched.
(2) UE discontinuously monitoring control channels on whole carrier waves.
Referring to Fig. 9, UE on all carrier waves according to certain cycle and discontinuously monitoring control channels, to obtain possible schedule information.In this scheme, at a time, UE still only monitors control information at the part member carrier.Compare with (1.2), can provide maximum dispatching flexibility to the base station, concrete reason repeats no more.
In embodiment two, the base station sends configuration signal to UE, indication UE monitoring control channel on which carrier wave.For the concrete form of configuration signal, multiple implementation can be arranged.
The first is to continue to use the DRX configuration signal of LTE system, only will increase the member carrier index in configuration signal.The configuration of DRX is that its concrete form adopts ASN (Abstract Syntax Notation, abstract syntax notation) coding by RRC (Radio Resources Control, Radio Resource control) signaling UE in LTE.For the mode of Fig. 7-Fig. 9, adopt the scheme identical with LTE to dispose respectively DRX process on each carrier wave, but being UE, the total effect of each member carrier DRX do not monitor simultaneously all member carriers at synchronization.Referring to table 1, be the first configuration signal signal table.
Table 1
| The member carrier index | The |
| 1 | DRX configuration information under the member carrier 1 (starting point, cycle, various Time length etc.) |
| 2 | DRX configuration information under the member carrier 2 (starting point, cycle, various Time length etc.) |
| …… | …… |
The implementation of the second configuration signal is, designs new configuration signal, realizes the unified configuration to DRX on a plurality of carrier waves.Such as configuration UE at member carrier 1,2 ..., between the N according to the configuration cycle and Timer length, carry out frequency hopping.For top table 1, the DRX information on each member carrier is continued to use the form of LTE, has wherein comprised the origin information (what UE begin discontinuous monitoring PDCCH constantly) of DRX.On the second execution mode, in order to reach the effect of frequency hopping, be the identical DRX cycle of UE configuration at different carrier, but different starting points.
In end side, after the terminal parses configuration signal obtains member carrier index and DRX configuration signal, on carrier wave corresponding to member carrier index, determine Active time according to the DRX configuration signal, at the Activetime monitoring control channel.
In addition, because the terminal of the compatible LTE of the DRX process need of LTE-A, so from the angle of each carrier wave, may adopt the DRX process identical with LTE, relevant DRX Timer also will adopt.The problem that an Active Time on the carrier wave and on duration on another carrier wave overlap in time can appear this moment.At this moment, can stipulate that UE only monitors one of them carrier wave at the moment, to reach better power saving performance.Referring to Figure 10, for Active time on the different carrier among the inventive method embodiment two overlaps schematic diagram.Among Figure 10, Active Time on the member carrier 2 expansion under the effect of timer and and member carrier 3 on next on duration coincidence, can set still monitoring control channel on carrier wave 2 only of UE this moment, avoid simultaneously monitoring control channel on carrier wave 2 and carrier wave 3 of UE, to reach better power saving performance.
Corresponding with said method, the present invention also provides a kind of device of controlling monitoring control channel in multi-carrier system.Particularly, this device can refer to base station equipment itself, also can refer to be positioned at the functional entity of base station equipment inside, can pass through software, hardware or software and hardware combining and realize.
Referring to Figure 11, be this device internal structure schematic diagram of base station side, comprising:
Configuration signal generation unit 1101 is used for generating configuration signal;
Configuration signal transmitting element 1102 is used for described configuration signal is sent to terminal, and indicating terminal is continuous monitoring control channel on partial carrier wave, perhaps, and discontinuously monitoring control channels on part or all of carrier wave.
Wherein:
Corresponding to embodiment one:
The configuration signal that configuration signal generation unit 1101 generates comprises the member carrier index; Configuration signal transmitting element 1102 indicating terminals are continuous monitoring control channel on carrier wave corresponding to described member carrier index.
Corresponding to embodiment two:
The configuration signal that configuration signal generation unit 1101 generates comprises member carrier index and DRX configuration signal, and described DRX configuration signal comprises starting point, cycle and timer length;
Configuration signal transmitting element 1102 indicates described terminal on carrier wave corresponding to described member carrier index, monitoring control channel in the Active time that determines according to the DRX configuration signal.
In embodiment two, preferably, can adopt frequency-hopping mode to realize configuration information, at this moment, the DRX configuration signal of each member carrier index has identical cycle, different starting points in the configuration signal that configuration signal generation unit 1101 generates.
In addition, the present invention also provides a kind of device of monitoring control channel in multi-carrier system.Particularly, this device can refer to terminal equipment itself, also can refer to be positioned at the functional entity of terminal equipment inside, can pass through software, hardware or software and hardware combining and realize.
Referring to Figure 12, be this device internal structure schematic diagram of end side, comprising:
Configuration signal receiving element 1201 is used for from base station reception configuration signal;
Control channel monitoring unit 1202 is used for according to described configuration signal, continuous monitoring control channel on partial carrier wave, perhaps, discontinuously monitoring control channels on part or all of carrier wave.
Preferably, this device also comprises:
Carrier wave selected cell 1203, be used for when configuration signal that configuration signal receiving element 1201 receives shows the effective time Active time coincidence that has two or more carrier waves, be used for therefrom selecting a carrier wave and indicator control channel monitoring unit 1 202 monitoring control channel on selected carrier wave.
Corresponding with the base station side device, the configuration signal that configuration signal receiving element 1201 receives comprises two kinds of forms:
A kind ofly be, configuration signal comprises the member carrier index, at this moment, and control channel monitoring unit 1202 continuous monitoring control channel on carrier wave corresponding to described member carrier index;
Another kind is, configuration signal comprises member carrier index and DRX configuration signal, and wherein the DRX configuration signal comprises starting point, cycle and timer length; At this moment, control channel monitoring unit 1202 on carrier wave corresponding to described member carrier index, monitoring control channel in the Active time that determines according to the DRX configuration signal.
Among the present invention, terminal is continuous monitoring control channel on partial carrier wave only, perhaps, discontinuously monitoring control channels on partial carrier wave or all carrier waves, rather than on all carrier waves continuous monitoring control channel, thereby can save the electric weight of terminal.
As seen, the present invention is based on carrier aggregation technology, proposed the DRX scheme of frequency domain, can in multicarrier system, improve the power saving performance of terminal.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. the method for a monitoring control channel in multi-carrier system is characterized in that, comprising:
The base station issues configuration signal to terminal, and indicating terminal is discontinuously monitoring control channels on part or all of carrier wave;
Terminal is according to the configuration signal monitoring control channel of base station;
When the effective time of two or more carrier waves, Active time overlapped, described terminal is monitoring control channel on carrier wave therein.
2. described method according to claim 1 is characterized in that,
Described configuration signal comprises member carrier index and discontinuous reception DRX configuration signal, and described DRX configuration signal comprises starting point, cycle and timer length;
Described terminal comprises according to the process of the configuration signal monitoring control channel of base station: described terminal on carrier wave corresponding to member carrier index, monitoring control channel in the Active time that determines according to the DRX configuration signal.
3. described method according to claim 2 is characterized in that the DRX configuration signal of each member carrier index has identical cycle, different starting points in the described configuration signal.
4. a device of controlling monitoring control channel in multi-carrier system is characterized in that, comprising:
The configuration signal generation unit is used for generating configuration signal;
The configuration signal transmitting element is used for described configuration signal is sent to terminal, and indicating terminal is discontinuously monitoring control channels on part or all of carrier wave;
Wherein, when described configuration signal showed that Active time effective time that has two or more carrier waves overlaps, described terminal is monitoring control channel on carrier wave therein.
5. described device according to claim 4 is characterized in that,
The configuration signal that described configuration signal generation unit generates comprises member carrier index and discontinuous reception DRX configuration signal, and described DRX configuration signal comprises starting point, cycle and timer length;
Described configuration signal transmitting element indicates described terminal on carrier wave corresponding to described member carrier index, at the effective time of determining according to the DRX configuration signal of monitoring control channel in the Active time.
6. described device according to claim 5 is characterized in that, the DRX configuration signal of each member carrier index has identical cycle, different starting points in the configuration signal that described configuration signal generation unit generates.
7. the device of a monitoring control channel in multi-carrier system is characterized in that, comprising:
The configuration signal receiving element is used for from base station reception configuration signal;
The control channel monitoring unit is used for according to described configuration signal, discontinuously monitoring control channels on part or all of carrier wave;
The carrier wave selected cell, when the configuration signal that receives when the configuration signal receiving element shows the effective time Active time coincidence that has two or more carrier waves, be used for therefrom selecting a carrier wave, and indicate described control channel monitoring unit monitoring control channel on selected carrier wave.
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