CN102244927B - Method, equipment and terminal for establishing uplink synchronization in multi-cell long-term evolution system - Google Patents
Method, equipment and terminal for establishing uplink synchronization in multi-cell long-term evolution system Download PDFInfo
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Abstract
The invention discloses a method, equipment and terminal for establishing uplink synchronization in a multi-cell long-term evolution system, wherein the method can be used for reducing the control channel spending of the system, increasing the resource utilization rate, shortening the waiting time required for performing uplink and downlink data transmission between the terminal and a base station and guaranteeing the service normal operation. The method for establishing the uplink synchronization in the multi-cell long-term evolution system, provided in the embodiment of the invention comprises the following steps: the base station sends an activating/deactivating command to the terminal so as to inform the terminal to initiate a random access process on an appointed secondary cell in activated secondary cells while activating one or more secondary cells in a terminal TA (Timing Advance) group, wherein an random access command is carried in the activating/deactivating command; and, after the appointed secondary cell is activated, the terminal instantly executes the random access process of the appointed secondary cell and the base station according to the received random access command so as to establish the uplink synchronization.
Description
Technical field
The present invention relates to wireless communication technology field, especially relate to method, the network equipment and the terminal of setting up uplink synchronous in a kind of multiple cell long evolving system.
Background technology
Third generation partner program (The Third Generation Partner Project, 3GPP) in version Release 10, propose the New function such as carrier aggregation, subscriber equipment (User Equipment can be supported, UE) on multiple community, carry out uplink and downlink transfer of data simultaneously, obtain higher peak rate by larger bandwidth (as maximum bandwidth can reach 100MHz).
A UE can be configured to be operated in a main plot (Primary Cell simultaneously, and several auxiliary communities (Secondary Cell PCell), SCell), each community of its work can comprise a downlink member carrier, zero or uplink member carrier, and this multiple cell operation also can be called carrier aggregation (Carrier Aggregation) or aggregated bandwidth.Release 10 is provided with a up timing reference cell for the UE be operated under carrier aggregation mode, i.e. main plot, UE only maintaining uplink timing on main plot, the up timing of every other community all locks onto on main plot, these communities do not need maintaining uplink timing, directly obtain up transmission timing from timing reference cell.
But, at carrier aggregation Long Term Evolution (the Long Term Evolution of 3GPP Release 11, LTE) in communication system, uplink timing advance (Timing Advance is introduced to the community that UE supports, the concept of TA) dividing into groups, multiple microzonations of a UE are divided into multiple TA group, and each TA group comprises several communities, has a community as timing reference cell in the multiple communities in each TA group.
If do not comprise main plot in a TA group, the situation without uplink synchronous can be there is in all communities in this TA group simultaneously, when needing to utilize the community in this TA group to carry out transfer of data, a community initiating random access procedure first in this TA group is needed to set up uplink synchronous, see Fig. 1, existing processing method is that base station sends activation/deactivation order to UE, is activated auxiliary community multiple in a TA group, after UE receives this activation/deactivation order, to base station feedback response message; Then, base station sends PDCCH order to UE, and for UE specifies a random access lead code (Preamble), UE uses this random access lead code initiating random access procedure on a Ge Fu community.
Inventor is realizing finding at least there is following defect in prior art in process of the present invention:
In existing mechanism, the activation of auxiliary community and the initiation of Stochastic accessing need respectively by two independently signaling realizations, and the Radio Resource taken needed for causing is more, and resource utilization is also lower; After Qie Fu community is activated, also will experience network response time, PDCCH order issue the time after, ability initiating random access procedure, cause auxiliary community long from being activated to the time delay obtaining uplink synchronous, UE and base station need to wait for that the longer time could utilize corresponding auxiliary community to carry out the transmission of up-downgoing data, and this time delay may have influence on the normal operation of business, when network environment is poor, even may cause the interruption of business, cause Consumer's Experience lower.
Summary of the invention
Embodiments provide method, equipment and the terminal of setting up uplink synchronous in a kind of multiple cell long evolving system, the control channel expense of system can be reduced, improve resource utilization, shorten terminal and base station and carry out the up-downgoing transfer of data required time waited for, ensure that the normal operation of business.
For achieving the above object, the technical scheme of the embodiment of the present invention is achieved in that
Embodiments provide a kind of method setting up uplink synchronous in multiple cell long evolving system, comprising:
Base station sends activation/deactivation order with while activating the one or more auxiliary community in the grouping of described terminal TA to terminal, initiating random access procedure on the auxiliary community of appointment of notification terminal in activated auxiliary community, wherein, Stochastic accessing order is carried in described activation/deactivation order;
Terminal, after the auxiliary community of described appointment is activated, is specified the random access procedure of auxiliary community and base station immediately, is set up uplink synchronous according to the Stochastic accessing command execution received.
The embodiment of the present invention additionally provides the network equipment setting up uplink synchronous in a kind of multiple cell long evolving system, and the described network equipment comprises command sending unit and uplink synchronous sets up unit,
Described command sending unit, for sending activation/deactivation order to terminal with while activating the one or more auxiliary community in the grouping of described terminal TA, initiating random access procedure on the auxiliary community of appointment of notification terminal in activated auxiliary community, wherein, Stochastic accessing order is carried in described activation/deactivation order;
Described uplink synchronous sets up unit, for described activation after the auxiliary community of appointment perform random access procedure, set up uplink synchronous.
The embodiment of the present invention additionally provides the terminal setting up uplink synchronous in a kind of multiple cell long evolving system, and described terminal comprises order receiving element and uplink synchronous sets up unit,
Described order receiving element, for receiving the activation/deactivation order that base station sends, while being informed in the one or more auxiliary community activated in TA grouping, specify initiating random access procedure on auxiliary community for one in activated auxiliary community, wherein, Stochastic accessing order is carried in described activation/deactivation order, described Stochastic accessing order is carried in the activation/deactivation MAC CE of activation/deactivation order MAC PDU, or, in described Stochastic accessing order, be carried at the Stochastic accessing order MAC CE set up in activation/deactivation order MAC PDU;
Described uplink synchronous sets up unit, for after the auxiliary community of described appointment is activated, specifies the random access procedure of auxiliary community and base station immediately, set up uplink synchronous according to the Stochastic accessing command execution received.
From above-mentioned, the technical scheme of the embodiment of the present invention can utilize a signaling to realize the activation of auxiliary community and the initiation process of Stochastic accessing simultaneously, decrease the transmission times of PDCCH order in whole uplink synchronous process, thus reduce the control channel expense of system, the Radio Resource taken needed for reducing, improves resource utilization; And due to this programme can after auxiliary community be activated, at once random access procedure is performed, avoid and activate to the time delay obtaining uplink synchronous from auxiliary community, effectively shortening terminal and base station utilizes respective secondary community to carry out the up-downgoing transfer of data required time waited for, ensure that the normal operation of business, improve Consumer's Experience.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the auxiliary community of activation of the prior art and the method flow schematic diagram obtaining uplink synchronous;
The method flow schematic diagram of uplink synchronous is set up in a kind of multiple cell long evolving system that Fig. 2 provides for the embodiment of the present invention one;
The schematic diagram of an example of up timed maintenance mechanism under the TA packet mode that Fig. 3 provides for the embodiment of the present invention two;
Fig. 4 is the activation/deactivation MAC CE structural representation of existing auxiliary community activation/deactivation order;
Fig. 5 for the embodiment of the present invention two provide a kind of expansion after activation/deactivation MACCE structural representation;
A kind of Stochastic accessing order MACCE structural representation set up that Fig. 6 provides for the embodiment of the present invention two;
The structural representation of the network equipment of uplink synchronous is set up in a kind of multiple cell long evolving system that Fig. 7 provides for the embodiment of the present invention three;
The structural representation of the terminal of uplink synchronous is set up in a kind of multiple cell long evolving system that Fig. 8 provides for the embodiment of the present invention three.
Embodiment
Below in conjunction with accompanying drawing of the present invention, be clearly and completely described technical scheme of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of protection of the invention.
The embodiment of the present invention one provides a kind of method setting up uplink synchronous in multiple cell long evolving system, and see Fig. 2, the method comprises:
21: base station sends activation/deactivation order with terminal uplink Timing Advance (Timing Advance as described in activation to terminal (as UE), TA) while the one or more auxiliary community (SCell) in grouping, initiating random access procedure on the auxiliary community of appointment of notification terminal in activated auxiliary community, wherein, Stochastic accessing order is carried in described activation/deactivation order.
Carry random access lead code (Preamble) mark required when performing random access operation in above-mentioned Stochastic accessing order, utilize corresponding lead code to carry out Stochastic accessing to enable terminal.
22: terminal sends hybrid automatic repeat-request (Hybrid Automatic Repeat Reque st, HARQ) feedback to base station.
Can guarantee that terminal receives the activation/deactivation order from base station by HARQ feedback.
23: terminal, after the auxiliary community of described appointment is activated, is specified the random access procedure of auxiliary community and base station immediately, set up uplink synchronous according to the Stochastic accessing command execution received.
From above-mentioned, the technical scheme of the embodiment of the present invention can utilize a signaling to realize the activation of auxiliary community and the initiation process of Stochastic accessing simultaneously, decrease the transmission times of PDCCH order in whole uplink synchronous process, thus reduce the control channel expense of system, the Radio Resource taken needed for reducing, improves resource utilization; And due to this programme can after auxiliary community be activated, at once random access procedure is performed, avoid and activate to the time delay obtaining uplink synchronous from auxiliary community, effectively shortening terminal and base station utilizes respective secondary community to carry out the up-downgoing transfer of data required time waited for, ensure that the normal operation of business, improve Consumer's Experience.
The method setting up uplink synchronous below in a kind of multiple cell long evolving system provided the embodiment of the present invention two is introduced.
See Fig. 3, an example of up timed maintenance mechanism under showing TA packet mode.Wherein, community 1 is main plot, and community 2 and community 1 form a TA group; Community 3 and community 4 form another TA group.For the TA group comprising community 1, main plot 1 inherently can maintaining uplink timing, community 2 directly obtains up timing from community 1.For the TA group that community 3 and community 4 are formed, need a community as timing reference cell, as using community 3 as timing reference cell time, community 4 obtains up timing from community 3.
Usually can be in state of activation due to main plot and keep uplink synchronous, so the embodiment of the present invention is mainly described the scene that the TA group be made up of auxiliary community (the TA group as being made up of community 3 and community 4) sets up uplink synchronous.Be appreciated that when needed, also this programme can be applied in and comprise in the TA group of main plot.
21: base station sends activation/deactivation order with while activating the one or more auxiliary community in the grouping of described terminal TA to terminal, initiating random access procedure on the auxiliary community of appointment of notification terminal in activated auxiliary community, wherein, Stochastic accessing order is carried in described activation/deactivation order.
The auxiliary community of above-mentioned appointment is the community of selected initiation Stochastic accessing, and be also the timing reference cell in TA grouping, terminal knows the auxiliary community of above-mentioned appointment by following at least one mode:
Base station sends signaling to terminal in advance, informs the mark of specifying auxiliary community described in terminal, this mode, can be pre-determined the timing reference cell in TA grouping, simplify Stochastic accessing order by the high-level signaling in network; Or,
Cell index (Cell Identifier, CID) is carried, to indicate the mark of the auxiliary community of described appointment needing to carry out Stochastic accessing in the Stochastic accessing order that terminal sends.This mode, utilizes this cell index can realize a kind of operation across community, as sent Stochastic accessing order in the subframe of community 4, the subframe of community 3 performs random access procedure, thus improve the utilance of Internet resources.This CID is not the required information in Stochastic accessing order, as when the timing reference cell in TA group is pre-configured, can omit this cell index in Stochastic accessing order.
Further, except above-mentioned cell index, the Stochastic accessing order set by the embodiment of the present invention also comprises: random access lead code code word mark (Preamble Identifier, PID) and wait number of sub frames K.
Terminal utilizes above-mentioned PID to know random access lead code, and utilizes this random access lead code to perform random access procedure.
Described wait number of sub frames K indicating terminal plays from receiving Stochastic accessing order the number of sub-frames K performing required wait between random access procedure.As received Stochastic accessing order as UE at subframe n, then perform Stochastic accessing according to the instruction UE of this wait number of sub frames when subframe n+K starts.
Arrange and wait for that the object of this parameter of number of sub frames K is the time performing Stochastic accessing for the ease of base station control UE, at this moment because when UE is passed in Stochastic accessing order and activation/deactivation order simultaneously, need the time considering that the frequency required for the auxiliary community of activation/deactivation retunes, UE needs initiating random access procedure after the moment that activation/deactivation order comes into force, namely ensure that after corresponding auxiliary community is in state of activation, perform random access procedure, thus ensure that the successful realization that uplink synchronous is set up.
This programme adopts and carry described Stochastic accessing order in the media access control protocol data unit MAC PDU of activation/deactivation order.
Concrete, following at least one mode can be utilized in the MAC PDU of activation/deactivation order to carry described Stochastic accessing order:
Mode one: activation/deactivation MAC Control Element (MAC CE) is expanded, Stochastic accessing order is carried in activation/deactivation MAC CE after expansion.This mode, expands existing activation/deactivation MAC CE, makes it comprise Stochastic accessing order.
See Fig. 4, for the activation/deactivation MAC CE structural representation of existing auxiliary community activation/deactivation order, this activation/deactivation MAC CE is made up of a byte, and each bit in byte except retaining position (R) represents the activation/deactivation state of the auxiliary community of respective identification.
See Fig. 5, it is the activation/deactivation MAC CE structural representation after a kind of expansion that the embodiment of the present invention provides.Activation/deactivation MAC CE after expansion comprises 3 bytes, wherein, carries CID and PID by 1 byte, carries wait number of sub frames by 1 byte.In Fig. 5, the concrete meaning of each symbol is as follows:
CID: cell index, value is the integer of 1-4
PID: random access lead code mark (Preamble ID) distributed for UE
K: wait for number of sub frames
R: retain position.
Mode two: again set up a Stochastic accessing order MAC CE, is carried at Stochastic accessing order in this Stochastic accessing order MAC CE set up.This mode, introduces a kind of new MAC Control Element, i.e. Stochastic accessing order MAC CE.
The Stochastic accessing order MAC CE set up comprises 2 bytes, carries CID and PID, carry wait number of sub frames by 1 byte by 1 byte.See Fig. 6, be a kind of Stochastic accessing order MAC CE structural representation set up that the embodiment of the present invention provides, in Fig. 6, the concrete meaning of each symbol is as follows:
CID: cell index, value is the integer of 1-4
PID: random access lead code mark (Preamble ID) distributed for UE
K: wait for number of sub frames
R: retain position.
Further, this programme can adjust the numerical value of described wait number of sub frames according to the entry-into-force time of auxiliary community activation manipulation, arranges the concrete numerical value of above-mentioned wait number of sub frames flexibly, guarantees that terminal performs random access procedure again after auxiliary community is activated.
Further, because special Preamble is scarce resource, base station also can control different UEs and send identical Preamble in different subframes, so also can adapt to the timing requirements simultaneously sending activation/deactivation order and Stochastic accessing order better.
22: terminal sends hybrid automatic repeat-request (Hybrid Automatic Repeat Request, HARQ) feedback to base station.
Can guarantee that terminal receives the activation/deactivation order from base station by HARQ feedback.In some scenes, also this HARQ feedback can not be set, with the speed of further Speed-up Establishment uplink synchronous.
23: terminal, after the auxiliary community of described appointment is activated, is specified the random access procedure of auxiliary community and base station immediately, set up uplink synchronous according to the Stochastic accessing command execution received.
In scene as shown in Figure 3, after auxiliary community 3 is activated, uplink synchronous according to the auxiliary community 3 of the Stochastic accessing command execution received and the random access procedure of base station, is set up immediately in auxiliary community 3.After uplink synchronous success is set up in auxiliary community 3, auxiliary community 4 directly can obtain uplink synchronous from auxiliary community 3.
From above-mentioned, the technical scheme of the embodiment of the present invention can utilize a signaling to realize the activation of auxiliary community and the initiation process of Stochastic accessing simultaneously, decrease the transmission times of PDCCH order in whole uplink synchronous process, thus reduce the control channel expense of system, the Radio Resource taken needed for reducing, improves resource utilization; And due to this programme can after auxiliary community be activated, at once random access procedure is performed, avoid and activate to the time delay obtaining uplink synchronous from auxiliary community, effectively shortening terminal and base station utilizes respective secondary community to carry out the up-downgoing transfer of data required time waited for, ensure that the normal operation of business, improve Consumer's Experience.
The embodiment of the present invention three provides the network equipment setting up uplink synchronous in a kind of multiple cell long evolving system, and see Fig. 7, the described network equipment comprises command sending unit 71 and uplink synchronous sets up unit 72,
Described command sending unit 71, for sending activation/deactivation order to terminal with while activating the one or more auxiliary community in the grouping of described terminal TA, initiating random access procedure on the auxiliary community of appointment of notification terminal in activated auxiliary community, wherein, Stochastic accessing order is carried in described activation/deactivation order;
Described uplink synchronous sets up unit 72, for described activation after the auxiliary community of appointment perform random access procedure, set up uplink synchronous.
Further, described command sending unit 71 utilizes following at least one mode to carry described Stochastic accessing order in the MAC PDU of activation/deactivation order:
Activation/deactivation MAC CE is expanded, Stochastic accessing order is carried in activation/deactivation MAC CE after expansion; Or, again set up a Stochastic accessing order MAC CE, Stochastic accessing order be carried in this Stochastic accessing order MAC CE set up.
The embodiment of the present invention three additionally provides the terminal setting up uplink synchronous in a kind of multiple cell long evolving system, and see Fig. 8, described terminal comprises order receiving element 81 and uplink synchronous sets up unit 82,
Described order receiving element 81, for receiving the activation/deactivation order that base station sends, while being informed in the one or more auxiliary community activated in TA grouping, specify initiating random access procedure on auxiliary community for one in activated auxiliary community, wherein, Stochastic accessing order is carried in described activation/deactivation order, described Stochastic accessing order is carried in the activation/deactivation MAC CE of activation/deactivation order MAC PDU, or, in described Stochastic accessing order, be carried at the Stochastic accessing order MAC CE set up in activation/deactivation order MAC PDU;
Described uplink synchronous sets up unit 82, for after the auxiliary community of described appointment is activated, specifies the random access procedure of auxiliary community and base station immediately, set up uplink synchronous according to the Stochastic accessing command execution received.
The specific works mode of each unit and module in apparatus of the present invention embodiment, see the related content of the inventive method embodiment.
From above-mentioned, the technical scheme of the embodiment of the present invention can utilize a signaling to realize the activation of auxiliary community and the initiation process of Stochastic accessing simultaneously, decrease the transmission times of PDCCH order in whole uplink synchronous process, thus reduce the control channel expense of system, the Radio Resource taken needed for reducing, improves resource utilization; And due to this programme can after auxiliary community be activated, at once random access procedure is performed, avoid and activate to the time delay obtaining uplink synchronous from auxiliary community, effectively shortening terminal and base station utilizes respective secondary community to carry out the up-downgoing transfer of data required time waited for, ensure that the normal operation of business, improve Consumer's Experience.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (6)
1. set up a method for uplink synchronous in multiple cell long evolving system, it is characterized in that, described method comprises:
Base station sends activation/deactivation order to terminal, Stochastic accessing order is carried in the media access control protocol data unit MAC PDU of activation/deactivation order, with while activating the one or more auxiliary community in the grouping of described terminal uplink timing advance TA, initiating random access procedure on the auxiliary community of appointment of notification terminal in activated auxiliary community;
Described Stochastic accessing order also comprises cell index CID, to indicate the mark of the auxiliary community of described appointment needing to carry out Stochastic accessing;
Terminal, after the auxiliary community of described appointment is activated, is specified the random access procedure of auxiliary community and base station immediately, is set up uplink synchronous according to the Stochastic accessing command execution received;
Following mode is utilized to carry described Stochastic accessing order in the MAC PDU of activation/deactivation order:
Activation/deactivation MAC Control Element MAC CE is expanded, Stochastic accessing order is carried in activation/deactivation MAC CE after expansion.
2. method according to claim 1, it is characterized in that, described Stochastic accessing order comprises random access lead code code word mark PID and waits for number of sub frames, and described wait number of sub frames indicating terminal plays the required number of sub-frames waited between execution random access procedure from receiving Stochastic accessing order.
3. method according to claim 1 and 2, is characterized in that,
The numerical value of described wait number of sub frames is adjusted according to the entry-into-force time of auxiliary community activation manipulation.
4. method according to claim 1, is characterized in that,
Activation/deactivation MAC CE after expansion comprises 3 bytes, wherein, carries CID and PID by 1 byte, carries wait number of sub frames by 1 byte;
The Stochastic accessing order MAC CE set up comprises 2 bytes, carries CID and PID, carry wait number of sub frames by 1 byte by 1 byte.
5. set up a network equipment for uplink synchronous in multiple cell long evolving system, it is characterized in that, the described network equipment comprises command sending unit and uplink synchronous sets up unit,
Described command sending unit, for carrying Stochastic accessing order when terminal sends activation/deactivation order in the media access control protocol data unit MAC PDU of activation/deactivation order, with while activating the one or more auxiliary community in the grouping of described terminal TA, initiating random access procedure on the auxiliary community of appointment of notification terminal in activated auxiliary community; Described Stochastic accessing order also comprises cell index CID, to indicate the mark of the auxiliary community of described appointment needing to carry out Stochastic accessing;
Described uplink synchronous sets up unit, for described activation after the auxiliary community of appointment perform random access procedure, set up uplink synchronous;
Described command sending unit utilizes following mode in the MACPDU of activation/deactivation order, carry described Stochastic accessing order:
Activation/deactivation MAC Control Element MAC CE is expanded, Stochastic accessing order is carried in activation/deactivation MAC CE after expansion.
6. set up a terminal for uplink synchronous in multiple cell long evolving system, it is characterized in that, described terminal comprises order receiving element and uplink synchronous sets up unit,
Described order receiving element, for receiving the activation/deactivation order that base station sends, while being informed in the one or more auxiliary community activated in TA grouping, specify initiating random access procedure on auxiliary community for one in activated auxiliary community, wherein, carry Stochastic accessing order in the media access control protocol data unit MAC PDU of described activation/deactivation order, described Stochastic accessing order is carried in the activation/deactivation MAC CE of activation/deactivation order MAC PDU; Described Stochastic accessing order also comprises cell index CID, to indicate the mark of the auxiliary community of described appointment needing to carry out Stochastic accessing;
Described uplink synchronous sets up unit, for after the auxiliary community of described appointment is activated, specifies the random access procedure of auxiliary community and base station immediately, set up uplink synchronous according to the Stochastic accessing command execution received.
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| CN102036411A (en) * | 2010-12-02 | 2011-04-27 | 大唐移动通信设备有限公司 | Method and device for random access |
| CN102123516A (en) * | 2011-03-31 | 2011-07-13 | 电信科学技术研究院 | Random access method and equipment based on multiple uplink timing advances |
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|---|---|
| CN102244927A (en) | 2011-11-16 |
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