CN102244927A - 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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- CN102244927A CN102244927A CN2011102067248A CN201110206724A CN102244927A CN 102244927 A CN102244927 A CN 102244927A CN 2011102067248 A CN2011102067248 A CN 2011102067248A CN 201110206724 A CN201110206724 A CN 201110206724A CN 102244927 A CN102244927 A CN 102244927A
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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 the long evolving system of a kind of many sub-districts.
Background technology
Third generation partner program (The Third Generation Partner Project, 3GPP) new function such as carrier aggregation has been proposed in version Release 10, can support subscriber equipment (User Equipment, UE) on a plurality of sub-districts, carry out the uplink and downlink transfer of data simultaneously, obtain higher peak rate by bigger bandwidth (can reach 100MHz) as maximum bandwidth.
A UE can be configured to be operated in simultaneously a main plot (Primary Cell, PCell) and several auxilliary sub-districts (Secondary Cell, SCell), each sub-district of its work can comprise a downlink member carrier, zero or uplink member carrier, and this many cell operations also can be called carrier aggregation (Carrier Aggregation) or bandwidth polymerization.Release 10 is provided with a up timing reference sub-district for the UE that is operated under the carrier aggregation mode, it is the main plot, only maintaining uplink timing on the main plot of UE, the up timing of every other sub-district all locks onto on the main plot, these sub-districts do not need maintaining uplink regularly, directly obtain up transmission from the timing reference sub-district and regularly get final product.
Yet, carrier aggregation Long Term Evolution (Long Term Evolution at 3GPP Release 11, LTE) in the communication system, up Timing Advance (Timing Advance has been introduced in the sub-district that UE supported, TA) Fen Zu notion, a plurality of microzonations of a UE are divided into a plurality of TA groups, and each TA group comprises several sub-districts, has a sub-district as the timing reference sub-district in a plurality of sub-districts in each TA group.
If do not comprise the main plot in the TA group, the situation of uplink synchronous can appear not having in all sub-districts in this TA group simultaneously, when transfer of data is carried out in the sub-district in needs utilize this TA group, need the sub-district of elder generation in this TA group to initiate random access procedure and set up uplink synchronous, referring to Fig. 1, existing processing method is that the base station sends the activation order to UE, and a plurality of auxilliary sub-districts in the TA group are activated, after UE receives this activation order, to the base station feedback response message; Then, the base station sends the PDCCH order to UE, and for UE specifies a random access lead code (Preamble), UE uses this random access lead code to initiate random access procedure on an auxilliary sub-district.
The inventor finds to exist at least in the prior art following defective in realizing process of the present invention:
In the existing mechanism, the activation of auxilliary sub-district and the initiation that inserts at random need cause the required Radio Resource that takies more respectively by two independently signaling realizations, and resource utilization is also lower; And after auxilliary sub-district is activated, also will be after the time that issues of the time of experiencing the network response, PDCCH order, could initiate random access procedure, cause auxilliary sub-district long from being activated to the time delay that obtains uplink synchronous, UE and base station need wait for that the long time could be utilized and assist the sub-district accordingly and carry out the transmission of up-downgoing data that this time delay may have influence on the normal operation of business, when network environment is relatively poor, even may cause professional interruption, cause user experience lower.
Summary of the invention
The embodiment of the invention provides method, equipment and the terminal of setting up uplink synchronous in the long evolving system of a kind of many sub-districts, can reduce the control channel expense of system, improve resource utilization, shorten the time that the required wait of up-downgoing transfer of data is carried out in terminal and base station, guaranteed professional normal operation.
For achieving the above object, the technical scheme of the embodiment of the invention is achieved in that
The embodiment of the invention provides the method for setting up uplink synchronous in the long evolving system of a kind of many sub-districts, comprising:
The base station sends the activation order with when activating the one or more auxilliary sub-district in the described terminal TA grouping to terminal, the notice terminal is assisted in an activate appointment of assisting in the sub-district and is initiated random access procedure on the sub-district, wherein, carry incoming order at random in the described activation order;
Terminal is carried out the random access procedure of auxilliary sub-district of described appointment and base station immediately according to the incoming order at random that has received after the auxilliary sub-district of described appointment is activated, set up uplink synchronous.
The embodiment of the invention also provides the network equipment of setting up uplink synchronous in the long evolving system of a kind of many sub-districts, and the described network equipment comprises that command sending unit and uplink synchronous set up the unit,
Described command sending unit, be used for sending the activation order with when activating the one or more auxilliary sub-district in the described terminal TA grouping to terminal, the notice terminal is assisted in an activate appointment of assisting in the sub-district and is initiated random access procedure on the sub-district, wherein, carry incoming order at random in the described activation order;
Described uplink synchronous is set up the unit, be used for described activation after the auxilliary sub-district of appointment carry out random access procedure, set up uplink synchronous.
The embodiment of the invention also provides the terminal of setting up uplink synchronous in the long evolving system of a kind of many sub-districts, and described terminal comprises that order receiving element and uplink synchronous set up the unit,
Described order receiving element, be used to receive the activation order that the base station sends, when being informed in the one or more auxilliary sub-district of activating in the TA grouping, specify activate in the auxilliary sub-district and to initiate random access procedure on the auxilliary sub-district, wherein, carry incoming order at random in the described activation order, described incoming order at random is carried among the activation MAC CE of activation order MAC PDU, perhaps, be carried at the MAC of the incoming order at random CE that sets up among the activation order MAC PDU in the described incoming order at random;
Described uplink synchronous is set up the unit, is used for after the auxilliary sub-district of described appointment is activated, and carries out the random access procedure of auxilliary sub-district of described appointment and base station immediately according to the incoming order at random that has received, sets up uplink synchronous.
By as seen above-mentioned, the technical scheme of the embodiment of the invention can utilize a signaling to realize the activation of auxilliary sub-district and the initiation process that inserts at random simultaneously, reduced the transmission number of times of PDCCH order in the whole uplink synchronous process, thereby reduced the control channel expense of system, reduce the required Radio Resource that takies, improved resource utilization; And because this programme can be after auxilliary sub-district be activated, at once carry out random access procedure, avoided activating to the time delay that obtains uplink synchronous from auxilliary sub-district, effectively having shortened terminal and base station utilizes the respective secondary sub-district to carry out the time of the required wait of up-downgoing transfer of data, guarantee professional normal operation, improved user experience.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is auxilliary sub-district of activation of the prior art and the method flow schematic diagram that obtains uplink synchronous;
Set up the method flow schematic diagram of uplink synchronous in a kind of many sub-districts long evolving system that Fig. 2 provides for the embodiment of the invention one;
The schematic diagram of an example of up timing maintenance mechanism under the TA packet mode that Fig. 3 provides for the embodiment of the invention two;
Fig. 4 is the activation MAC CE structural representation of existing auxilliary sub-district activation order;
Activation MACCE structural representation after a kind of expansion that Fig. 5 provides for the embodiment of the invention two;
A kind of MACCE of incoming order at random structural representation of setting up that Fig. 6 provides for the embodiment of the invention two;
Set up the structural representation of the network equipment of uplink synchronous in a kind of many sub-districts long evolving system that Fig. 7 provides for the embodiment of the invention three;
Set up the structural representation of the terminal of uplink synchronous in a kind of many sub-districts long evolving system that Fig. 8 provides for the embodiment of the invention three.
Embodiment
Below in conjunction with accompanying drawing of the present invention, technical scheme of the present invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills are obtained under the prerequisite of not making creative work belongs to the scope of protection of the invention.
The embodiment of the invention one provides the method for setting up uplink synchronous in the long evolving system of a kind of many sub-districts, and referring to Fig. 2, this method comprises:
21: the base station sends the activation order with the up Timing Advance of terminal (Timing Advance as described in activation to terminal (as UE), TA) grouping in one or more auxilliary sub-district (SCell) time, the notice terminal is assisted in an activate appointment of assisting in the sub-district and is initiated random access procedure on the sub-district, wherein, carry incoming order at random in the described activation order.
Carry random access lead code required when carrying out access operation at random (Preamble) sign in the above-mentioned incoming order at random, so that terminal can utilize corresponding lead code to insert at random.
22: terminal sends to the base station mixes automatic repeat requests (Hybrid Automatic Repeat Reque st, HARQ) feedback.
Can guarantee that by the HARQ feedback terminal receives the activation order from the base station.
23: terminal is carried out the random access procedure of auxilliary sub-district of described appointment and base station immediately according to the incoming order at random that has received after the auxilliary sub-district of described appointment is activated, set up uplink synchronous.
By as seen above-mentioned, the technical scheme of the embodiment of the invention can utilize a signaling to realize the activation of auxilliary sub-district and the initiation process that inserts at random simultaneously, reduced the transmission number of times of PDCCH order in the whole uplink synchronous process, thereby reduced the control channel expense of system, reduce the required Radio Resource that takies, improved resource utilization; And because this programme can be after auxilliary sub-district be activated, at once carry out random access procedure, avoided activating to the time delay that obtains uplink synchronous from auxilliary sub-district, effectively having shortened terminal and base station utilizes the respective secondary sub-district to carry out the time of the required wait of up-downgoing transfer of data, guarantee professional normal operation, improved user experience.
The method of setting up uplink synchronous below in a kind of many sub-districts long evolving system that the embodiment of the invention two is provided is introduced.
Referring to Fig. 3, shown an example of up timing maintenance mechanism under the TA packet mode.Wherein, sub-district 1 is the main plot, and sub-district 2 constitutes a TA group with sub-district 1; Sub-district 3 constitutes another TA group with sub-district 4.For the TA group that comprises sub-district 1, main plot 1 itself will maintaining uplink regularly, sub-district 2 directly 1 obtains up timing and gets final product from the sub-district.TA group for sub-district 3 and sub-district 4 constitutes needs a sub-district as the timing reference sub-district, and as with sub-district 3 during as the timing reference sub-district, sub-district 43 obtains up timing from the sub-district.
Because the main plot can be in state of activation usually and keep uplink synchronous, so the embodiment of the invention mainly describes the scene that the TA group (organizing as the TA that is made up of sub-district 3 and sub-district 4) that is made of auxilliary sub-district is set up uplink synchronous.Be appreciated that when needs, also this programme can be applied in the TA group that comprises the main plot.
21: the base station sends the activation order with when activating the one or more auxilliary sub-district in the described terminal TA grouping to terminal, the notice terminal is assisted in an activate appointment of assisting in the sub-district and is initiated random access procedure on the sub-district, wherein, carry incoming order at random in the described activation order.
The auxilliary sub-district of above-mentioned appointment is the sub-district that selected initiation inserts at random, also is the timing reference sub-district in the TA grouping, and terminal knows that by following at least a mode above-mentioned appointment assists the sub-district:
The base station sends signaling to terminal in advance, informs the sign of the auxilliary sub-district of the described appointment of terminal, and this mode can pre-determine the timing reference sub-district in the TA grouping by the high-level signaling in the network, simplifies incoming order at random; Perhaps,
(Cell Identifier CID), assists the sign of sub-district to indicate the described appointment that need insert at random to carry cell index in the incoming order at random that terminal sends.This mode utilizes this cell index can realize a kind of operation of striding the sub-district, as send incoming order at random on the subframe of sub-district 4, carries out random access procedure on the subframe of sub-district 3, thereby has improved utilization rate of network resource.This CID is not the essential information in the incoming order at random, as when the timing reference sub-district in the TA group is pre-configured, can omit this cell index in the incoming order at random.
Further, except above-mentioned cell index, the set incoming order at random of the embodiment of the invention also comprises: (Preamble Identifier is PID) with wait number of sub frames K for random access lead code code word sign.
Terminal utilizes above-mentioned PID to know random access lead code, and utilizes this random access lead code to carry out random access procedure.
Described wait number of sub frames K indicating terminal is from receiving that incoming order plays the number of sub-frames K that carries out required wait between the random access procedure at random.As receiving incoming order at random as UE at subframe n, then the indication UE according to this wait number of sub frames carries out access at random when subframe n+K begins.
It is to carry out the time of inserting at random for the ease of base stations control UE that the purpose of waiting for this parameter of number of sub frames K is set, at this moment because when incoming order and activation order are passed to UE simultaneously at random, the time that needs the needed frequency in the auxilliary sub-district of consideration activation to retune, UE need initiate random access procedure after the moment that the activation order comes into force, promptly guaranteed after corresponding auxilliary sub-district is in state of activation, carry out random access procedure, thereby guaranteed the successful realization that uplink synchronous is set up.
This programme adopts and carry described incoming order at random in the media access control protocol data unit MAC of activation order PDU.
Concrete, can utilize following at least a mode in the MAC of activation order PDU, to carry described incoming order at random:
Mode one: (MAC CE) expands to the activation MAC Control Element, and incoming order at random is carried among the activation MAC CE after the expansion.This mode is expanded existing activation MAC CE, makes it comprise incoming order at random.
Referring to Fig. 4, activation MAC CE structural representation for existing auxilliary sub-district activation order, this activation MAC CE is made up of a byte, and each bit in the byte except that keeping position (R) is represented the activation state of the auxilliary sub-district of respective identification.
Referring to Fig. 5, the activation MAC CE structural representation after a kind of expansion that provides for the embodiment of the invention.Activation MAC CE after the expansion comprises 3 bytes, wherein, carries CID and PID by 1 byte, carries the wait number of sub frames by 1 byte.The concrete implication of each symbol is as follows among Fig. 5:
CID: cell index, value are the integer of 1-4
PID: the random access lead code that distributes for UE identifies (Preamble ID)
K: wait for number of sub frames
R: keep the position.
Mode two: set up an incoming order MAC CE at random again, incoming order at random is carried among this MAC of incoming order at random CE that sets up.This mode is introduced a kind of new MAC Control Element, i.e. incoming order MAC CE at random.
The MAC of the incoming order at random CE that sets up comprises 2 bytes, carries CID and PID by 1 byte, carries the wait number of sub frames by 1 byte.Referring to Fig. 6, be a kind of MAC of incoming order at random CE structural representation of setting up that the embodiment of the invention provides, the concrete implication of each symbol is as follows among Fig. 6:
CID: cell index, value are the integer of 1-4
PID: the random access lead code that distributes for UE identifies (Preamble ID)
K: wait for number of sub frames
R: keep the position.
Further, this programme can be adjusted the numerical value of described wait number of sub frames according to the entry-into-force time of auxilliary sub-district activation manipulation, and the concrete numerical value of above-mentioned wait number of sub frames is set flexibly, guarantees that terminal carries out random access procedure again after the activation of auxilliary sub-district.
Further, because special-purpose Preamble is scarce resource, the base station also can be controlled different UEs and send identical Preamble in different subframes, so also can adapt to better to send the activation order and the timing demand of incoming order at random simultaneously.
22: terminal sends to the base station mixes automatic repeat requests (Hybrid Automatic Repeat Request, HARQ) feedback.
Can guarantee that by the HARQ feedback terminal receives the activation order from the base station.In some scenes, this HARQ feedback also can be set, set up the speed of uplink synchronous with further quickening.
23: terminal is carried out the random access procedure of auxilliary sub-district of described appointment and base station immediately according to the incoming order at random that has received after the auxilliary sub-district of described appointment is activated, set up uplink synchronous.
In the scene as shown in Figure 3, after auxilliary sub-district 3 was activated, auxilliary sub-district 3 was carried out the random access procedure of auxilliary sub-district 3 and base station immediately according to the incoming order at random that has received, set up uplink synchronous.After the uplink synchronous success was set up in auxilliary sub-district 3, auxilliary sub-district 4 can directly obtain uplink synchronous from auxilliary sub-district 3.
By as seen above-mentioned, the technical scheme of the embodiment of the invention can utilize a signaling to realize the activation of auxilliary sub-district and the initiation process that inserts at random simultaneously, reduced the transmission number of times of PDCCH order in the whole uplink synchronous process, thereby reduced the control channel expense of system, reduce the required Radio Resource that takies, improved resource utilization; And because this programme can be after auxilliary sub-district be activated, at once carry out random access procedure, avoided activating to the time delay that obtains uplink synchronous from auxilliary sub-district, effectively having shortened terminal and base station utilizes the respective secondary sub-district to carry out the time of the required wait of up-downgoing transfer of data, guarantee professional normal operation, improved user experience.
The embodiment of the invention three provides the network equipment of setting up uplink synchronous in the long evolving system of a kind of many sub-districts, and referring to Fig. 7, the described network equipment comprises that command sending unit 71 and uplink synchronous set up unit 72,
Described command sending unit 71, be used for sending the activation order with when activating the one or more auxilliary sub-district in the described terminal TA grouping to terminal, the notice terminal is assisted in an activate appointment of assisting in the sub-district and is initiated random access procedure on the sub-district, wherein, carry incoming order at random in the described activation order;
Described uplink synchronous is set up unit 72, be used for described activation after the auxilliary sub-district of appointment carry out random access procedure, set up uplink synchronous.
Further, described command sending unit 71 utilizes following at least a mode to carry described incoming order at random in the MAC of activation order PDU:
Activation MAC CE is expanded, incoming order at random is carried among the activation MAC CE after the expansion; Perhaps, set up an incoming order MAC CE at random again, incoming order at random is carried among this MAC of incoming order at random CE that sets up.
The embodiment of the invention three also provides the terminal of setting up uplink synchronous in the long evolving system of a kind of many sub-districts, and referring to Fig. 8, described terminal comprises that order receiving element 81 and uplink synchronous set up unit 82,
Described order receiving element 81, be used to receive the activation order that the base station sends, when being informed in the one or more auxilliary sub-district of activating in the TA grouping, specify activate in the auxilliary sub-district and to initiate random access procedure on the auxilliary sub-district, wherein, carry incoming order at random in the described activation order, described incoming order at random is carried among the activation MAC CE of activation order MAC PDU, perhaps, be carried at the MAC of the incoming order at random CE that sets up among the activation order MAC PDU in the described incoming order at random;
Described uplink synchronous is set up unit 82, is used for after the auxilliary sub-district of described appointment is activated, and carries out the random access procedure of auxilliary sub-district of described appointment and base station immediately according to the incoming order at random that has received, sets up uplink synchronous.
The concrete working method of each unit and module among apparatus of the present invention embodiment is referring to the related content of the inventive method embodiment.
By as seen above-mentioned, the technical scheme of the embodiment of the invention can utilize a signaling to realize the activation of auxilliary sub-district and the initiation process that inserts at random simultaneously, reduced the transmission number of times of PDCCH order in the whole uplink synchronous process, thereby reduced the control channel expense of system, reduce the required Radio Resource that takies, improved resource utilization; And because this programme can be after auxilliary sub-district be activated, at once carry out random access procedure, avoided activating to the time delay that obtains uplink synchronous from auxilliary sub-district, effectively having shortened terminal and base station utilizes the respective secondary sub-district to carry out the time of the required wait of up-downgoing transfer of data, guarantee professional normal operation, improved user experience.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. set up the method for uplink synchronous more than one kind in the long evolving system of sub-district, it is characterized in that, described method comprises:
The base station sends the activation order with when activating the one or more auxilliary sub-district in the up timing advance TA grouping of described terminal to terminal, the notice terminal is assisted in an activate appointment of assisting in the sub-district and is initiated random access procedure on the sub-district, wherein, carry incoming order at random in the described activation order;
Terminal is carried out the random access procedure of auxilliary sub-district of described appointment and base station immediately according to the incoming order at random that has received after the auxilliary sub-district of described appointment is activated, set up uplink synchronous.
2. method according to claim 1 is characterized in that,
In the media access control protocol data unit MAC of activation order PDU, carry described incoming order at random.
3. method according to claim 2 is characterized in that, utilizes following at least a mode to carry described incoming order at random in the MAC of activation order PDU:
Activation MAC Control Element MAC CE is expanded, incoming order at random is carried among the activation MAC CE after the expansion; Perhaps,
Again set up an incoming order MAC CE at random, incoming order at random is carried among this MAC of incoming order at random CE that sets up.
4. method according to claim 3, it is characterized in that, described incoming order at random comprises random access lead code code word sign PID and waits for number of sub frames that described wait number of sub frames indicating terminal is from receiving that incoming order plays the number of sub-frames of carrying out required wait between the random access procedure at random.
5. method according to claim 3 is characterized in that, terminal knows that by following at least a mode described appointment assists the sub-district:
The base station sends signaling to terminal in advance, informs the sign of the auxilliary sub-district of the described appointment of terminal;
Perhaps,
Described incoming order at random also comprises cell index CID, to indicate the sign of the auxilliary sub-district of described appointment that need insert at random.
6. according to claim 4 or 5 described methods, it is characterized in that,
Adjust the numerical value of described wait number of sub frames according to the entry-into-force time of auxilliary sub-district activation manipulation.
7. method according to claim 3 is characterized in that,
Activation MAC CE after the expansion comprises 3 bytes, wherein, carries CID and PID by 1 byte, carries the wait number of sub frames by 1 byte;
The MAC of the incoming order at random CE that sets up comprises 2 bytes, carries CID and PID by 1 byte, carries the wait number of sub frames by 1 byte.
8. set up the network equipment of uplink synchronous more than one kind in the long evolving system of sub-district, it is characterized in that, the described network equipment comprises that command sending unit and uplink synchronous set up the unit,
Described command sending unit, be used for sending the activation order with when activating the one or more auxilliary sub-district in the described terminal TA grouping to terminal, the notice terminal is assisted in an activate appointment of assisting in the sub-district and is initiated random access procedure on the sub-district, wherein, carry incoming order at random in the described activation order;
Described uplink synchronous is set up the unit, be used for described activation after the auxilliary sub-district of appointment carry out random access procedure, set up uplink synchronous.
9. the network equipment according to claim 8 is characterized in that, described command sending unit utilizes following at least a mode to carry described incoming order at random in the MAC of activation order PDU:
Activation MAC Control Element MAC CE is expanded, incoming order at random is carried among the activation MAC CE after the expansion; Perhaps,
Again set up an incoming order MAC CE at random, incoming order at random is carried among this MAC of incoming order at random CE that sets up.
10. set up the terminal of uplink synchronous more than one kind in the long evolving system of sub-district, it is characterized in that, described terminal comprises that order receiving element and uplink synchronous set up the unit,
Described order receiving element, be used to receive the activation order that the base station sends, when being informed in the one or more auxilliary sub-district of activating in the TA grouping, specify activate in the auxilliary sub-district and to initiate random access procedure on the auxilliary sub-district, wherein, carry incoming order at random in the described activation order, described incoming order at random is carried among the activation MAC CE of activation order MAC PDU, perhaps, be carried at the MAC of the incoming order at random CE that sets up among the activation order MAC PDU in the described incoming order at random;
Described uplink synchronous is set up the unit, is used for after the auxilliary sub-district of described appointment is activated, and carries out the random access procedure of auxilliary sub-district of described appointment and base station immediately according to the incoming order at random that has received, sets up uplink synchronous.
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