CN102238665A - Random access method, base station, user equipment and system - Google Patents
Random access method, base station, user equipment and system Download PDFInfo
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Abstract
The invention discloses a random access method, base stations, user equipment and a system. The method comprises the following steps: a target base station receives a switching request message sent by a source base station; the target base station determines the random access component carrier (RCC) of the UE (User Equipment) on the target base station and sends a switching request response message to the source base station, and the switching request response message comprises the RCC information and random access resource information on the RCC; the source base station receives the switching request response message and sends a switching command; and after receiving the switching command, the UE keeps communicating with the source base station and initiates a random access process at the RCC. Through the invention, the seamless switching of the UE from the source base station to the target base station is ensured, and business interruption is reduced.
Description
Technical field
The present invention relates to wireless communication field, accidental access method, base station, subscriber equipment and system in particularly a kind of handoff procedure.
Background technology
LTE (Long Term Evolution, Long Term Evolution) in the system, UE (UserEquipment, subscriber equipment) to before the base station transmission data, the uplink synchronous that needs acquisition and base station, promptly obtain transmitting time lead (Time Advance is called for short TA), UE reaches this purpose by random access procedure.When under UE is in connected state, needing carry out to switch, need to disconnect the communication with source base station, initiate to insert at random at target BS, obtain with the down-going synchronous of base station and TA after promptly insert at random finish after, UE can carry out normal communication with target BS.
For higher data rate is provided to the mobile subscriber, advanced long-term evolution system (Long Term Evolution Advance, abbreviation LTE-A) carrier aggregation technology (Carrier Aggregation has been proposed, be called for short CA), its objective is to the UE with respective capabilities provides bigger broadband, improve the peak rate of UE.Among the LTE, the maximum transmission bandwidth of system's support is 20MHz, and carrier aggregation is that two or more component carrier (Component Carriers is called for short CC) polymerization are got up to support that maximum is no more than the transmission bandwidth of 100MHz greater than 20MHz.Based on present frequency spectrum resource anxiety, can not always have component carrier continuous on the frequency domain can distribute to operator uses, therefore whether carrier aggregation is continuous on frequency domain by each component carrier, can divide continuous carrier aggregation and discrete carrier aggregation, so-called continuous carrier aggregation is meant that each component carrier is interconnective on frequency domain; Discontinuous carrier aggregation then refers to it is unconnected between each component carrier on frequency domain.Carrier aggregation by each component carrier whether in identical frequency band, the carrier aggregation and the carrier aggregation of striding frequency band (over multiple frequency bands) that can be divided into single band (single band), so-called single carrier aggregation is meant all component carriers that participate in carrier aggregation all in same frequency band, and single carrier aggregation can be that continuous carrier aggregation also can be discontinuous carrier aggregation; The carrier aggregation that what is called is striden frequency band is meant that the component carrier that participates in carrier aggregation can be derived from different frequency bands, and the carrier aggregation of striding frequency band only may the continuous carrier aggregation of right and wrong.LTE-A UE with carrier aggregation ability, transceive data on a plurality of component carriers simultaneously.Corresponding, the transmitting apparatus of UE and receiving equipment can be cover baseband equipments, an one-segment, bandwidth also can be many cover baseband equipments greater than 20MHz, and a plurality of frequency ranges, each band bandwidth is less than 20MHz.Because each component carrier may be striden frequency band, the wireless environment of the component carrier of different frequency bands has very big difference, and the TA of these component carriers may be different, therefore might need to carry out a plurality of random access procedures.Random access procedure includes conflict and does not have two kinds of conflicts, the random access procedure of conflict is arranged owing to may there be conflict, so length consuming time, conflict free random access procedure weak point consuming time.
At present, when network side order UE switches to target BS, UE may disconnect the communication with source base station, initiate random access procedure at target BS, after random access procedure finishes, direct and target BS carries out communication, thereby can't guarantee that UE is from the seamless switching of source base station to target BS.
Summary of the invention
Main purpose of the present invention is to provide a kind of accidental access method, base station, subscriber equipment and system, can't guarantee in the correlation technique that to solve at least UE is from the problem of source base station to the seamless switching of target BS.
According to an aspect of the present invention, provide a kind of accidental access method, having comprised: the handoff request message that target BS reception sources base station sends; Target BS is determined the at random access component carrier RCC of UE on target BS, and sends handover request ack message to source base station, and this handover request ack message comprises the random access resource information on RCC information and the RCC; Source base station receives handover request ack message, sends switching command to UE; After UE receives switching command, the communication of maintenance and source base station, and at RCC initiation random access procedure.
According to a further aspect in the invention, also provide a kind of base station of random access system, comprised source base station and target BS, wherein, target BS comprises: first receiver module is used for the handoff request message that the reception sources base station sends; Determination module is used for determining the at random access component carrier RCC of UE on target BS; First sending module is used for sending handover request ack message to source base station, and this handover request ack message comprises the random access resource information on RCC information and the RCC; Source base station comprises: second sending module is used for sending handoff request message to target BS; Second receiver module is used for receiving the request response of changing, and sends switching command to UE, and notice UE protects the communication with source base station, and initiates random access procedure at RCC.
According to a further aspect in the invention, also provide a kind of user equipment (UE) of random access system, having comprised: the order receiver module, be used for the switching command that the reception sources base station sends, this switching command comprises the component carrier of the access at random RCC information of target BS; Handover module is used to keep the communication with source base station, and initiates random access procedure at the RCC of target BS.
According to a further aspect in the invention, also provide a kind of random access system, comprised above-mentioned base station and UE.
The present invention by UE from source base station to the target BS handoff procedure, target BS is determined the at random access component carrier RCC of UE on target BS, and notify to be switched user equipment (UE) with this RCC information by source base station, make UE in maintenance and source base station communication, use auxilliary component carrier SCC or directly insert target BS by RCC, thereby guaranteed that UE from the seamless switching of source base station to target BS, has reduced service disconnection.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the switching model figure that switches to target BS according to the UE among a kind of LTE-A of the embodiment of the invention from source base station;
Fig. 2 forms structure chart according to the UE among a kind of LTE-A of the embodiment of the invention;
Fig. 3 is the switching flow figure that switches to target BS according to the UE among a kind of LTE-A of the embodiment of the invention from source base station;
Fig. 4 is the flow chart of steps according to accidental access method in a kind of handoff procedure of the embodiment of the invention;
Fig. 5 is the switching model figure that switches to target BS according to the UE among a kind of LTE-A of the preferred embodiment of the present invention one from source base station;
Fig. 6 is the switching model figure that switches to target BS according to the UE among a kind of LTE-A of the preferred embodiment of the present invention two from source base station;
Fig. 7 is the switching model figure that switches to target BS according to the UE among a kind of LTE-A of the preferred embodiment of the present invention five from source base station;
Fig. 8 is the structured flowchart according to the base station of a kind of random access system of the embodiment of the invention;
Fig. 9 is the structured flowchart according to the user equipment (UE) of a kind of random access system of the embodiment of the invention;
Figure 10 is the structured flowchart according to a kind of random access system of the embodiment of the invention.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Among the LTE-A, UE can pass through a plurality of component carriers (as CC1 after entering connected state simultaneously, CC2) carry out communication with source base station, one of them is principal component carrier wave (PrimaryComponent Carrier, be called for short PCC) as CC1, other be auxilliary component carrier (Secondary Component Carrier as CC2, be called for short SCC), NAS (NetworkAttached Storage, network attached storage) information is obtained by PCC, RLF (Reliable Linked Frame takes place if DL is PCC (down link PCC), reliable type chain type frame), UE need carry out RRC (Radio Resource Control, Radio Resource control) process of reconstruction, the RRC process of reconstruction must cause service disconnection, and DL SCC can deexcitation, therefore DLPCC and UL CC (up link CC) are in state of activation always, and that mention hereinafter that deexcitation CC refers to all is deexcitation corresponding D L CC.UE switches to target BS (as CC3 when the network side order, CC4, PCC can specify in switching command, can not specify yet) time, UE can keep with the source base station communication in, initiate random access procedure at target BS, after random access procedure finishes, disconnect communication again with source base station, to reach the purpose of seamless switching, as shown in Figure 1.Target BS can know that source base station distributes to the component carrier information of UE by the X2/S1 interface in the said process, and the information such as receiver equipment thereof ability of UE.The composition of UE as shown in Figure 2, two kinds of possibility situations are arranged usually, a kind of may situation be to comprise handover module (to comprise the switching command that receives network side and carry out the module of switching, be called for short HO), measurement module (comprises the measurement control order and the execution that receive network side and measures and measure the module that reports, be called for short MM), data communication module (the module of the packet of execution and base station exchange user face or chain of command, be called for short DC), and RACH (Random Access Channel, Random Access Channel) module, shown in (b) among Fig. 2, wherein, the RACH module can the based target sub-district the downlink system time service, and can finish access function at random, comprise random access procedure based on conflict or non-conflict.The another possibility situation is to comprise HO, and MM and a plurality of DC module are shown in (a) among Fig. 2.
The switching flow that UE among the LTE-A switches to target BS from source base station may further comprise the steps as shown in Figure 3:
Step S302: the source base station decision switches to target BS, sends to target BS and switches warning order;
Step S304: target BS is received the switching warning order, returns to switch to source base station and prepares response message;
Step S306: source base station sends switching command to terminal;
Step S308: terminal receives switching command, initiates random access procedure to target BS;
Step S310: after random access procedure was finished, terminal was returned handoff completion message to target BS.
UE in the embodiment of the invention all can adopt and form structure as shown in Figure 2, and switching flow as shown in Figure 3.
By the following examples the distribution method of the random access resource in the handoff procedure of the present invention is done to describe.In following examples, each component carrier in the LTE-A sub-district can synchronously also can be asynchronous, and the carrier wave of cell-of-origin and Target cell can synchronously also can be asynchronous, and cell-of-origin and Target cell can belong to same base also can belong to different base station.
With reference to Fig. 4, show flow chart of steps according to accidental access method in a kind of handoff procedure of the embodiment of the invention, may further comprise the steps:
Step S402: the handoff request message that target BS reception sources base station sends;
Step S404: target BS is determined the at random access component carrier RCC of UE on target BS, and sends handover request ack message to source base station;
Wherein, this handover request ack message comprises described RCC information, and the random access resource on the described RCC.
Step S406: source base station receives handover request ack message, sends switching command to UE;
Step S408:UE receives switching command, the communication of maintenance and source base station, and at RCC initiation random access procedure.
In this step, use, need the notification source base station so, after source base station receives handover request ack message, therefrom obtain RCC information if these RCC source base stations have been distributed to UE.Then, send switching command to UE.The switching command of source base station by sending to UE, notice UE keep the connection of PCC and initiate random access procedure at described RCC.
In the correlation technique, UE from source base station to the handoff procedure of target BS, UE may disconnect and being connected of source base station, thereby can't realize seamless switching.Pass through present embodiment, UE is in handoff procedure, remaining with when the PCC of source base station is connected, inserting the RCC that target BS is selected according to the PCC and the SCC of the current use of UE by target BS, thereby realized the seamless switching of UE from the source base station to the target BS.
With reference to Fig. 5, show the switching model figure that switches to target BS according to the UE among a kind of LTE-A of the preferred embodiment of the present invention one from source base station.In the present embodiment, carrier aggregation sub-district 1, the component carrier of support is CC1, CC2 and CC3, all is positioned at frequency band 1 and continuous.UE resides on the CC1, because service needed is initiated to insert at random and successful access network on CC1, CC1 is PCC.Carrier aggregation sub-district 2, the component carrier of support is CC4 and CC5, is positioned at frequency band 1, and CC4 and CC3 are continuous, and CC4 and CC5 are discontinuous.The transmitting apparatus of UE and receiving equipment are three cover baseband equipments, and every cover baseband equipment all is a frequency range, and bandwidth is 20MHz, and UE has three DC modules.
Current UE is being used CC1, CC2 and CC3, and DC1 is responsible for the data communication on the CC1, and DC2 is responsible for the data communication on the CC2, and DC3 is responsible for the data communication on the CC3.The network side decision allows UE switch in the carrier aggregation sub-district 2, and the target BS to carrier aggregation sub-district 2 sends the switching warning order, and this switching flow can be as shown in Figure 3.At this moment, carrier aggregation sub-district 1 is the cell-of-origin, and its base station is a source base station; Carrier aggregation sub-district 2 is a Target cell, and its base station is a target BS.Switch the receiver equipment thereof ability information that comprises UE in the warning order (i.e. three DC, bandwidth is 20MHz), can also comprise the information of the PCC (being CC1) of current UE and/or the information of the current auxilliary component carrier that is using of UE (being CC2 and CC3), following examples are similar, no longer repeat.
After the target BS of carrier aggregation sub-district 2 is received and switched warning order, find that CC4 and CC3 are adjacent component carriers, therefore decision allows UE insert Target cell by CC4, is the UE reserved resource.Use the carrier wave of different frequency, can guarantee the connection of PCC; And use the carrier wave of side frequency, and can be in the connection that guarantees PCC, make that UE is easier to seamlessly switch to target BS from source base station.Target BS sends to switch prepares the source base station of response command to carrier aggregation sub-district 1, comprise the information that inserts component carrier RCC (being CC4) at random in this switching command, can also comprise C-RNTI (the Cell Radio Network Temporary Identity that carrier aggregation sub-district 2 is distributed, Cell Radio Network Temporary Identifier/Identity, Cell-RNTI), the information of carrier aggregation sub-district 2 is (as the random access resource information on the CC4, be that UE initiates to insert at random on CC4), and indication UE carries out the seamless switching process.Notify carrier aggregation sub-district 1 simultaneously, UE will initiate to insert at random on CC4.If CC4 (as carrier aggregation sub-district 2 one-component carrier wave CC4 is only arranged, perhaps, current of UE is in the scope that CC4 covers) is supported in 2 of carrier aggregation sub-districts, UE can only initiate random access procedure on CC4 so.
If do not comprise the information of the current SCC that is using of UE (being CC2 and CC3) in the handoff request order, 2 selections of carrier aggregation sub-district (are that CC4 and CC5 can with the CC of CC1 different frequency so, as CC5), notice UE initiates random access procedure on CC5, random access procedure is initiated in the communication (as CC2) that UE disconnects on CC2 or the CC3 on CC5.
After receive carrier aggregation sub-district 1, by switching command RCC information is transmitted to UE, find that simultaneously CC4 and CC3 are continuous component carriers, and CC1 is that PCC can not disconnect, therefore notifies UE to disconnect communication (promptly initiating random access procedure to the target BS of Target cell) on the CC3 by DC3.Source base station can reach the purpose that notice UE disconnects the communication on the CC3 by the mode deexcitation CC3 of explicit or implicit expression, and perhaps source base station is not dispatched CC3 after the transmission switching command is to UE.Above-mentioned explicit referring to by signaling UE, implicit expression refer to UE and receive after the order that disconnects communication own to the CC3 deexcitation.Source base station is by stopping scheduling or deexcitation CC3, to guarantee the smooth switching of UE.
After UE receives switching command, disconnect the communication on the CC3, the CC4 of the target BS on carrier aggregation sub-district 2 initiates random access procedure, uses the common preamble sign indicating number.When UE does not have idle DC, keep the connection of PCC, disconnect corresponding SCC, guarantee being connected of UE and source base station as much as possible, and then guaranteed that also UE is from the seamless switching process of source base station to target BS.
If current of UE has used two DC such as DC1 and DC2, DC3 is idle DC, UE just can initiate random access procedure by DC3 so, thereby do not need to disconnect the communication with the source base station of carrier aggregation sub-district 1, carrier aggregation sub-district 1 does not need to notify UE to disconnect the communication of CC2 on the carrier aggregation sub-district 1 yet.If current UE has only two DC modules, only use CC1 and CC2, then do not need clearly to indicate UE to disconnect the communication of CC2, because CC1 is PCC, can not disconnect, at this moment, can only disconnect CC2 and insert at random.
After random access procedure is finished, after the down-going synchronous and TA of UE acquisition and carrier aggregation sub-district 2, beginning is carried out communication with carrier aggregation sub-district 2,2 switchings of notice carrier aggregation sub-district are finished, carrier aggregation sub-district 2 notice core net are carried out the path exchange, and UE disconnects and the communication of carrier aggregation sub-district 1 on CC1 and CC2.
If random access procedure failure, source base station begin to reschedule the above-mentioned state of activation that needs the CC that switches or recover above-mentioned deexcitation CC, corresponding has explicit and mode implicit expression.The explicit cell-of-origin that refers to is by signaling UE, and implicit expression refers to and activates automatically after UE sends the handoff failure order to the cell-of-origin, and perhaps the cell-of-origin begins to dispatch above-mentioned CC receiving after UE sends to the handoff failure order.Source base station needs CC that switches or the state of activation of recovering deexcitation CC by rescheduling, thereby guarantees the proper communication between UE recovery and the source base station.
With reference to Fig. 6, show the switching model figure that switches to target BS according to the UE among a kind of LTE-A of the preferred embodiment of the present invention two from source base station.In the present embodiment, carrier aggregation sub-district 1, the component carrier of support is CC1 and CC2, all is positioned at frequency band 1 and continuous.UE resides on the CC2, because service needed is initiated to insert at random and successful access network on CC2, CC2 is PCC.Carrier aggregation sub-district 2, the component carrier of support is CC1 and CC5, is positioned at frequency band 2 continuously.The transmitting apparatus of UE and receiving equipment are two cover baseband equipments, and every cover baseband equipment all is a frequency range, and bandwidth is 20MHz, and UE has two DC modules.
Current UE is being used CC1 and CC2, and DC1 is responsible for the data communication on the CC1, and DC2 is responsible for the data communication on the CC2.The network side decision allows UE switch in the carrier aggregation sub-district 2, sends to switch the target BS of warning order to carrier aggregation sub-district 2, and the CC2 that comprises the current UE use is the information of PCC, and the SCC information of using, and this switching flow can be as shown in Figure 3.In the present embodiment, carrier aggregation sub-district 1 is the cell-of-origin, and its base station is a source base station; Carrier aggregation sub-district 2 is a Target cell, and the base station of its ownership is a target BS.
After the target BS of carrier aggregation sub-district 2 is received and switched warning order, find source base station for UE has distributed CC1, therefore decision allows UE insert Target cell by CC1, and CC1 is for inserting component carrier RCC at random.Use same frequency CC as RCC, make that UE need not frequency hopping when switching, random access procedure is more easy.Target BS is the UE reserved resource, send to switch and prepare response command to carrier aggregation sub-district 1, this switching prepares to comprise RCC information (being CC1 information) in the response command, also comprise the C-RNTI that carrier aggregation sub-district 2 is distributed, the information of carrier aggregation sub-district 2 is (as the random access resource information on the CC1, be that UE initiates to insert at random on CC1, though CC1 and CC2, CC5 is continuous, because the component carrier that carrier aggregation sub-district 1 and carrier aggregation sub-district 2 are supported all comprises CC1, therefore UE can only initiate to insert at random on CC1), and indication UE carries out the seamless switching process.Notify the target BS of carrier aggregation sub-district 1 simultaneously, UE will initiate to insert at random on CC1.
If UE has three DC modules, DC3 is idle DC, because the carrier aggregation of CC1 is all supported in Target cell and cell-of-origin, the target BS of Target cell notice UE initiates to insert at random by CC5 so.
After the source base station of carrier aggregation sub-district 1 receives that response command is prepared in the switching of target BS, be transmitted to UE by switching command, find that simultaneously Target cell indication UE inserts Target cell by CC1, notify UE to disconnect communication on the CC1 (can not notify this moment, need disconnect communication with cell-of-origin CC1 certainly because UE inserts Target cell by CC1) simultaneously.Source base station comprises RCC information in the switching command that UE sends.
After UE receives switching command, disconnect the communication on the CC1, the CC1 on carrier aggregation sub-district 2 initiates random access procedure, uses the common preamble sign indicating number.When UE does not have idle receiver, keep the connection of PCC, disconnect the SCC that is using, can not interrupt with being connected of source base station with abundant assurance UE.
After random access procedure is finished, after the down-going synchronous and TA of UE acquisition and carrier aggregation sub-district 2, beginning is carried out communication with carrier aggregation sub-district 2,2 switchings of notice carrier aggregation sub-district are finished, carrier aggregation sub-district 2 notice core net are carried out the path exchange, and UE disconnects and the communication of carrier aggregation sub-district 1 on CC2.
Referring again to Fig. 1, show UE among a kind of LTE-A of the preferred embodiment of the present invention three switches to target BS from source base station switching model figure.In the present embodiment, carrier aggregation sub-district 1, the component carrier of support is CC1 and CC2, it is discontinuous to be positioned at frequency band 1.UE resides on the CC1, because service needed is initiated random access procedure on CC1, CC1 is PCC.Carrier aggregation sub-district 2, the component carrier of support is CC4 and CC5, lays respectively in frequency band 2 and the frequency band 3.The transmitting apparatus of UE and receiving equipment are three cover baseband equipments, and every cover baseband equipment all is a frequency range, and bandwidth is 20MHz, and UE has three DC modules.
Current UE is being used CC1 and CC2, and DC1 is responsible for the data communication on the CC1, and DC2 is responsible for the data communication on the CC2, the DC3 free time.The network side decision allows UE switch in the carrier aggregation sub-district 2, source base station sends and switches the target BS of warning order to carrier aggregation sub-district 2, switch the information that warning order comprises the PCC (being CC1) of current UE, and the current SCC information of using, this switching flow can be as shown in Figure 3.Carrier aggregation sub-district 1 is the cell-of-origin, and its base station is a source base station; Carrier aggregation sub-district 2 is a Target cell, and the base station of its ownership is a target BS.
After the target BS of carrier aggregation sub-district 2 is received the switching warning order of source base station transmission, determine that CC4 and/or CC5 are for inserting component carrier RCC at random, be the UE reserved resource, and the source base station of preparation response command to carrier aggregation sub-district 1 switched in transmission, this switching prepares to comprise RCC information in the response command, can also comprise the C-RNTI that carrier aggregation sub-district 2 is distributed, the information of carrier aggregation sub-district 2 is (as the random access resource information on CC4 and the CC5, be that UE can initiate to insert at random on CC4 and/or CC5, at this moment, can divide the random access procedure of initiating by the tag slot is one or two.In addition, the priority that CC4 can also be set is 1 (high priority), and the priority of CC5 is 2 (low priorities), if only need initiate a random access procedure, UE can select high priority such as CC4 to initiate to insert at random so, perhaps selects low priority such as CC5 to initiate to insert at random.Each component carrier of implicit expression notice UE access priority at random can also be come by the method that dedicated preamble is set in carrier aggregation sub-district 2, because it is conflict free using the random access procedure of dedicated preamble, therefore, UE can preferentially select to have distributed the component carrier of dedicated preamble to carry out access at random), and indication UE carries out the seamless switching process.Notify the source base station of carrier aggregation sub-district 1 simultaneously, UE will initiate to insert at random on CC4 and/or CC5.If the component carrier that carrier aggregation sub-district 2 is supported is CC4, CC5 and CC6 equally also can select to carry out the component carrier of random access procedure according to this principle.
After the source base station of carrier aggregation sub-district 1 is received the switching warning order of target BS transmission, be transmitted to UE by switching command, initiate two random access procedures if desired, then need to notify the communication on the UE disconnection CC2, perhaps the priority of CC1 is set to 1 (high priority), the priority of CC2 is set to 2 (low priorities), and UE preferentially disconnects the communication on low priority such as the CC2.Perhaps, priority that also can CC1 is set to 1 (low priority), and the priority of CC2 is set to 2 (high priorities), and UE preferentially disconnects the communication on high priority such as the CC2.Source base station comprises RCC information in the switching command that UE sends.
After UE received switching command, idle DC3 initiated random access procedure on CC4, initiate two random access procedures if desired, then disconnects the communication on the CC2, and the CC5 of DC2 on carrier aggregation sub-district 2 initiates random access procedure, uses the common preamble sign indicating number.Use idle receiver directly to insert RCC, effectively guaranteed being connected of UE and source base station, and then realized better that UE is from the seamless switching of source base station to target BS.
After random access procedure on CC4 and/or the CC5 is finished, after the down-going synchronous and TA of UE acquisition and carrier aggregation sub-district 2, beginning is carried out communication with carrier aggregation sub-district 2,2 switchings of notice carrier aggregation sub-district are finished, carrier aggregation sub-district 2 notice core net are carried out the path exchange, and UE disconnects and the communication of carrier aggregation sub-district 1 on CC1.
In the said process, initiate two random access procedures if desired, the communication on the UE disconnection CC2 also can be notified in carrier aggregation sub-district 1, and DC2 and DC3 initiate random access procedure simultaneously.
Referring again to Fig. 1, show UE among a kind of LTE-A of the preferred embodiment of the present invention four switches to target BS from source base station switching model figure.In the present embodiment, carrier aggregation sub-district 1, the component carrier of support is CC1 and CC2, all is positioned at frequency band 1.UE resides on the CC2, because business demand is initiated to insert access network at random on CC2, CC2 is PCC.Carrier aggregation sub-district 2, the component carrier of support are CC4 and CC5, all are positioned at frequency band 2.The transmitting apparatus of UE and receiving equipment are two cover baseband equipments, two frequency ranges, and each band bandwidth is less than 20MHz, and promptly UE has two DC modules, adds a RACH module.
Current UE has been used CC1 and CC2 simultaneously, and DC1 is responsible for the data communication on the CC1, and DC2 is responsible for the data communication on the CC2.The network side decision allows UE switch in the carrier aggregation sub-district 2, source base station sends and switches the target BS of warning order to carrier aggregation sub-district 2, switch the information that warning order comprises the PCC (being CC2) of current UE, and the SCC information used of current UE, this switching flow can be as shown in Figure 3, carrier aggregation sub-district 1 is the cell-of-origin, and its base station is a source base station; Carrier aggregation sub-district 2 is a Target cell, and the base station of its ownership is a target BS.
After the target BS of carrier aggregation sub-district 2 is received the switching warning order of source base station transmission,, determine that inserting component carrier RCC at random is CC4 and/or CC5 according to current PCC that is using of UE and SCC information.Target BS distributes a dedicated preamble, be included in to switch and prepare to send to carrier aggregation sub-district 1 in the response command, this switching prepares also to comprise RCC information in the response command, can also comprise the C-RNTI that carrier aggregation sub-district 2 is distributed, the information of carrier aggregation sub-district 2 is (as the random access resource information on the CC4, be that UE initiates to insert at random on CC4), and indication UE carries out the seamless switching process, carrier aggregation sub-district 1 is transmitted to UE by switching command, Target cell can be notified carrier aggregation sub-district 1, and UE will initiate to insert at random by the RACH module on CC4.
After UE received switching command, the CC4 on carrier aggregation sub-district 2 initiated random access procedure by the RACH module, the dedicated preamble of using carrier aggregation sub-district 2 to distribute.Use the RACH module, can on the basis of the PCC of interruption U E not and the current SCC that is using, directly initiate random access procedure, lowered system's implementation complexity.
After random access procedure is finished, the function executing of RACH module finishes, after the down-going synchronous and TA of UE acquisition and carrier aggregation sub-district 2, beginning is carried out communication with carrier aggregation sub-district 2,2 switchings of notice carrier aggregation sub-district are finished, carrier aggregation sub-district 2 notice core net are carried out the path exchange, and UE disconnects the communication with carrier aggregation sub-district 1.
With reference to Fig. 7, show the switching model figure that switches to target BS according to the UE among a kind of LTE-A of the preferred embodiment of the present invention five from source base station.In the present embodiment, carrier aggregation sub-district 1, the component carrier of support is CC1 and CC2, all is positioned at frequency band 1 and continuous.UE resides among the CC1, because service needed is initiated to insert at random and access network at CC1, CC1 is PCC.Carrier aggregation sub-district 2, the component carrier of support are CC4 and CC5, all are positioned at frequency band 1, and CC4 and CC1 are continuous, and CC4 and CC5 are discontinuous.The transmitting apparatus of UE and receiving equipment are cover baseband equipments, and a frequency range, bandwidth are 60MHz, and promptly UE has a DC module.
Current UE is being used CC1 and CC2, and DC1 is responsible for the data communication on CC1 and the CC2.Network side decision allows UE switch in the carrier aggregation sub-district 2, sends to switch warning order to carrier aggregation sub-district 2, switches the information that warning order comprises the PCC (being CC1) of current UE, and the SCC information used of current UE.Flow process as shown in Figure 3, carrier aggregation sub-district 1 is the cell-of-origin, its base station is a source base station; Carrier aggregation sub-district 2 is a Target cell, and the base station of its ownership is a target BS.
After the target BS of carrier aggregation sub-district 2 is received the switching warning order of source base station transmission, find that CC4 and CC1 are continuous, decision allows UE insert Target cell by CC4, be the UE reserved resource, send to switch and prepare the source base station of response command to carrier aggregation sub-district 1, this switching prepares to comprise RCC information in the response command, can also comprise the C-RNTI that carrier aggregation sub-district 2 is distributed, the information of carrier aggregation sub-district 2 (as the random access resource information on the CC4, promptly UE initiates to insert at random on CC4).The source base station of carrier aggregation sub-district 1 is transmitted to UE by switching command, and indication UE carries out the seamless switching process.Notify carrier aggregation sub-district 1 simultaneously, UE will initiate to insert at random on CC4.
After UE receives the switching command of source base station, owing to have only a DC module, but CC4 and CC1 are continuous, and the bandwidth that UE supports is 60M, therefore the operating state of DC module is adjusted to 60M, the CC4 on carrier aggregation sub-district 2 initiates random access procedure, uses the common preamble sign indicating number.Have only at UE under the situation of a DC, use the spread bandwidth of UE to insert at random, effectively guaranteed being connected of UE and source base station, realized seamless switching.
After random access procedure was finished, after the down-going synchronous and TA of UE acquisition and carrier aggregation sub-district 2, beginning was carried out communication with carrier aggregation sub-district 2, and 2 switchings of notice carrier aggregation sub-district are finished, and carrier aggregation sub-district 2 notifies core net to carry out the path exchange.
If CC4 and CC1 are discontinuous, Target cell can all be notified UE with the random access resource of CC4 and CC5 so, allows UE be chosen in which CC voluntarily and goes up the initiation random access procedure.
Need to prove that in the present embodiment, if the component carrier that carrier aggregation sub-district 2 is supported is CC1 and CC5, wherein, CC1, CC2 and CC5 are continuous.UE only has a receiver such as DC1, and the UE bandwidth is 40MHz, and then UE can use DC1, by disconnecting the communication on the CC2, uses the spread bandwidth of UE to insert target BS by RCC (being CC5 at this moment).Perhaps, when the spread bandwidth that takies as CC2 was idle, UE can directly use its expansion broadband by RCC (being CC5 at this moment) access target BS.
Referring again to Fig. 6, show the switching model figure that switches to target BS according to the UE among a kind of LTE-A of the embodiment of the invention six from source base station.In the present embodiment, carrier aggregation sub-district 1, the component carrier of support is CC1 and CC2, it is discontinuous to be positioned at frequency band 1.UE resides on the CC2, because service needed is initiated to insert at random and access network on CC2, CC2 is PCC.Carrier aggregation sub-district 2, the component carrier of support is CC1 and CC5, lays respectively in frequency band 1 and the frequency band 3.The transmitting apparatus of UE and receiving equipment are two cover baseband equipments, and every cover baseband equipment all is a frequency range, and bandwidth is 20MHz, and UE has two DC modules.
Current UE is being used CC1 and CC2, and DC1 is responsible for the data communication on the CC1, and DC2 is responsible for the data communication on the CC2.The network side decision allows UE switch in the carrier aggregation sub-district 2, source base station sends and switches the target BS of warning order to carrier aggregation sub-district 2, switch the information that warning order comprises the PCC (being CC2) of current UE, and the SCC information used of current UE, this switching flow can be as shown in Figure 3.Carrier aggregation sub-district 1 is the cell-of-origin, and its base station is a source base station; Carrier aggregation sub-district 2 is a Target cell, and the base station of its ownership is a target BS.
The target BS of carrier aggregation sub-district 2 is defined as CC1 and/or CC5 for inserting component carrier RCC at random after receiving the switching warning order of source base station transmission, is the UE reserved resource.Target BS sends to switch prepares the source base station of response command to carrier aggregation sub-district 1, comprise RCC information in this switching command, can also comprise the C-RNTI that carrier aggregation sub-district 2 is distributed, the information of carrier aggregation sub-district 2 is (as the random access resource information on CC1 and the CC5, be that UE can initiate to insert at random on CC1 and/or CC5), and indication UE carries out the seamless switching process.Simultaneously, notice carrier aggregation sub-district 1, UE will initiate to insert at random on CC1 and/or CC5.
The source base station of carrier aggregation sub-district 1 is transmitted to UE by switching command after receiving that response command is prepared in the switching of target BS transmission.
After UE receives the switching command that source base station sends, find that carrier aggregation sub-district 1 and carrier aggregation sub-district 2 all support component carrier CC1, and CC2 is PCC, UE selects to disconnect the communication on the CC1, and DC1 initiates random access procedure on CC1, use the common preamble sign indicating number.
After random access procedure on the CC1 is finished, after the down-going synchronous and TA of UE acquisition and carrier aggregation sub-district 2, beginning is carried out communication with carrier aggregation sub-district 2,2 switchings of notice carrier aggregation sub-district are finished, carrier aggregation sub-district 2 notice core net are carried out the path exchange, and UE disconnects and the communication of carrier aggregation sub-district 1 on CC2.
Above-mentioned, if the component carrier that carrier aggregation sub-district 2 is supported is CC4 and CC5, comprised the random access resource information on CC4 and the CC5 simultaneously in the switching command, UE can be chosen in CC4 or the last initiation of CC5 random access procedure voluntarily so, and UE can select to disconnect the communication on CC1 or the CC2 voluntarily.
With reference to Fig. 8, show structured flowchart according to the base station of a kind of random access system of the embodiment of the invention, comprising: source base station 802 and target BS 804.
Wherein, source base station 802 comprises: second sending module 8022, be used for sending the handoff request message to target BS 804, preferred, this handoff request message draw together the current use of UE principal component carrier wave PCC information and/or auxilliary component carrier SCC information; Second receiver module 8024 is used for the handover request ack message that receiving target base station 804 sends, and sends switching command to described UE, and notice UE keeps the communication with source base station, and initiates random access procedure at RCC.
Wherein, target BS 804 comprises: first receiver module 8042, be used for the handoff request message that reception sources base station 802 sends, preferred, this handoff request message draw together the current use of UE principal component carrier wave PCC information and/or auxilliary component carrier SCC information; Determination module 8044 is used for determining the at random access component carrier RCC of UE on target BS 804, and is preferred, is used for determining the at random access component carrier RCC of UE on target BS 804 according to the PCC information and/or the SCC information of the current use of UE; First sending module 8046 is used for sending handover request ack message to source base station 802, and this handover request ack message comprises the RCC information of target BS 804 and the random access resource information on the described RCC.
Preferably, determination module 8044 can comprise: first determination module is used for determining that the RCC of UE on target BS 804 is the PCC that using with UE and the component carrier CC of SCC different frequency; And/or second determination module is used for determining that the RCC of UE on target BS 804 is for assisting the CC of component carrier SCC same frequencys with source base station 802.
For example, when source base station 802 decision switched to target BS 804, second sending module 8022 of source base station 802 sent the handoff request message to target BS 804, this handoff request message draw together the current use of UE PCC information and/or SCC information.After first receiver module 8042 of target BS 804 received the handoff request message of source base station 802 transmissions, determination module 8044 was determined the at random access component carrier RCC of UE on target BS 804 according to the PCC information and/or the SCC information of the current use of UE in the handoff request message.First sending module 8046 of target BS 804 sends handover request ack message to source base station 802, comprises the RCC information of target BS 804 in this handover request ack message.The handover request ack message that first sending module 8046 of second receiver module, the 8024 receiving target base stations 804 of source base station 802 sends, and UE transmission switching command, notice UE keeps the communication with source base station, and initiates random access procedure at RCC.
With reference to Fig. 9, show structured flowchart according to the user equipment (UE) of a kind of random access system of the embodiment of the invention, comprise: order receiver module 902, be used for the switching command that the reception sources base station sends, this switching command comprises the component carrier of the access at random RCC information of target BS; Handover module 904 is used to keep the communication with source base station, and initiates random access procedure at the RCC of target BS.
Preferably, handover module 904 can comprise: the Random Access Channel RACH module of enhancing is used to keep the communication with source base station, and directly initiates random access procedure at described RCC; And/or a plurality of receivers are used to keep the communication with source base station, use at least one in a plurality of receivers, initiate random access procedure at described RCC.
Preferably, handover module 904 can comprise: a receiver, be used at the SCC of source base station and the RCC consecutive hours of target BS, and keep communication with source base station, use the spread bandwidth of receiver, by disconnecting described SCC or directly initiating random access procedure at described RCC.
For example, after order receiver module 902 receives the switching command of source base station transmission, obtain the component carrier of the access at random RCC information of target BS from this switching command, handover module 904 is initiated random access procedure at the RCC of target BS in the communication that keeps with source base station.Preferably, when UE has the Random Access Channel RACH module of enhancing, in the communication of maintenance and source base station, directly use this RACH module to initiate random access procedure at RCC.And/or UE has a plurality of receivers, and when having idle receiver in a plurality of receivers, UE uses this free time receiver directly to initiate random access procedure at RCC in the communication of maintenance and source base station; When not having idle receiver in a plurality of receivers, UE uses busy receiver, by disconnect the source base station appointment busy receiver on communication initiate random access procedure at RCC.
Preferably, when UE has only a receiver, in the communication of maintenance and source base station, use the spread bandwidth of this receiver, initiate random access procedure (this spread bandwidth is taken by SCC) by SCC at RCC, perhaps directly initiate random access procedure (this spread bandwidth free time) at RCC.
With reference to Figure 10, show structured flowchart according to a kind of random access system of the embodiment of the invention, comprising: source base station 1002, target BS 1004 and to be switched UE1006.
Wherein, source base station 1002 comprises: second sending module 10022, be used for sending the handoff request message to target BS 1004, preferred, this handoff request message draw together the current use of UE principal component carrier wave PCC information and/or auxilliary component carrier SCC information; Second receiver module 10024 is used for the handover request ack message that receiving target base station 1004 sends, and sends switching command to UE, and notice UE keeps the communication with source base station, and initiates random access procedure at RCC.
Wherein, target BS 1004 comprises: first receiver module 10042, be used for the handoff request message that reception sources base station 1002 sends, preferred, this handoff request message draw together the current use of UE principal component carrier wave PCC information and/or auxilliary component carrier SCC information; Determination module 10044 is used for determining the at random access component carrier RCC of UE on target BS 1004, and is preferred, is used for determining the at random access component carrier RCC of UE on target BS 1004 according to the PCC information and/or the SCC information of the current use of UE; First sending module 10046 is used for sending handover request ack message to source base station 1002, and this handover request ack message comprises the RCC information of target BS 1004 and the random access resource information of this RCC information.
Wherein, UE1006 comprises: order receiver module 10062, be used for the switching command that the reception sources base station sends, and this switching command comprises the component carrier of the access at random RCC information of target BS; Handover module 10064 is used to keep the communication with source base station, and initiates random access procedure at the RCC of target BS.
Preferably, determination module 10044 can comprise: first determination module is used for determining that the RCC of UE on target BS 1004 is the PCC that using with UE and/or the component carrier CC of SCC different frequency; And/or second determination module is used for determining that the RCC of UE on target BS 1004 is for assisting the CC of component carrier SCC same frequencys with source base station 1002.
Preferably, handover module 10064 can comprise: the Random Access Channel RACH module of enhancing is used to keep the communication with source base station, and directly initiates random access procedure at described RCC; And/or a plurality of receivers are used to keep the communication with source base station, use at least one in a plurality of receivers, by disconnecting SCC or directly initiating random access procedure at RCC.
Preferably, handover module 10064 can comprise: a receiver, be used to keep the communication with source base station, and use the spread bandwidth of receiver, by disconnecting SCC or directly initiating random access procedure at RCC.
Need to prove that if target BS by the method for the above embodiment of the present invention, in the time of still can't selecting suitable RCC, can adopt: (1) UE selects RCC voluntarily; (2) source base station is selected RCC, and notice UE (explicit and implicit expression).
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (21)
1. an accidental access method is characterized in that, comprising:
The handoff request message that target BS reception sources base station sends;
Described target BS is determined the at random access component carrier RCC of UE on described target BS, and sends handover request ack message to described source base station, and described handover request ack message comprises the random access resource information on described RCC information and the described RCC;
Described source base station receives described handover request ack message, sends switching command to described UE;
After described UE receives described switching command, the communication of maintenance and described source base station, and at described RCC initiation random access procedure.
2. method according to claim 1 is characterized in that, described handoff request message is drawn together the PCC information and/or the auxilliary component carrier SCC information of the described current use of described UE.
3. method according to claim 1 is characterized in that, described switching command comprises: UE carries out the seamless switching indication information, and perhaps, UE keeps and described source base station communication indication information.
4. method according to claim 1 is characterized in that, described target BS is determined the RCC of described UE on described target BS, and comprises to the step of described source base station transmission handover request ack message:
Described target BS is determined the RCC of described UE on described target BS;
Described target BS judges that described RCC is distributed to described UE by described source base station;
Described target BS sends handover request ack message to described source base station, notifies the described UE of described source base station to initiate random access procedure at described RCC.
5. method according to claim 1 is characterized in that, described target BS determines that according to described PCC information and/or described SCC information the step of the RCC of described UE on described target BS comprises:
Described target BS determines that the described RCC of described UE on described target BS is the described PCC that using with described UE and/or the component carrier CC of described SCC different frequency.
6. method according to claim 5 is characterized in that, described target BS determines that the RCC of described UE on described target BS comprises for the step of the CC of the described PCC that using with described UE and/or described SCC different frequency:
Described target BS determines that the RCC of described UE on described target BS is the described PCC that using with described UE and/or the CC of described SCC side frequency.
7. method according to claim 1 is characterized in that,
Described UE comprises the Random Access Channel RACH module of enhancing;
Described UE keeps the communication with described source base station, and comprises in the step of described RCC initiation random access procedure:
Described UE keeps the communication with described source base station, uses the RACH module of described enhancing to initiate random access procedure at described RCC;
Perhaps,
Described UE comprises idle receiver;
Described UE keeps the communication with described source base station, and comprises in the step of described RCC initiation random access procedure:
Described UE keeps the communication with described source base station, uses described idle receiver to initiate random access procedure at described RCC.
8. method according to claim 1 is characterized in that, described UE comprises a plurality of busy receivers; Described UE keeps the communication with described source base station, and comprises in the step of described RCC initiation random access procedure:
Described UE receives the switching command that described source base station sends, described switching command comprises that the described UE of indication initiates the described busy receiver information that described random access procedure uses, perhaps, indicate described UE for initiating the described SCC information that described random access procedure disconnects;
Described UE keeps the communication with described source base station, uses the described busy receiver of indicating in the described switching command, perhaps, disconnects the described SCC and the communication of source base station that indicate in the described switching command, at described RCC initiation random access procedure;
Perhaps,
Described UE keeps the communication with described source base station, decides in its sole discretion and uses at least one described busy receiver, perhaps, disconnects at least one and the described SCC of described source base station communication, at described RCC initiation random access procedure.
9. method according to claim 1 is characterized in that, described UE comprises a receiver; The SCC of described RCC and described source base station is continuous; Described UE keeps the communication with described source base station, and comprises in the step of described RCC initiation random access procedure:
Described UE keeps the communication with described source base station, by disconnecting at least one described SCC, or uses the spread bandwidth of described receiver, initiates random access procedure at described RCC.
10. method according to claim 1 is characterized in that, described target BS determines that the step of the RCC of UE on described target BS comprises:
Described target BS determine the RCC of UE on described target BS for described source base station in the CC of auxilliary component carrier SCC same frequency.
11. method according to claim 10 is characterized in that, described UE comprises a plurality of busy receivers; Described UE keeps the communication with described source base station, and comprises in the step of described RCC initiation random access procedure:
Described UE keeps the communication with described source base station, uses busy receiver, perhaps, disconnect SCC, initiate random access procedure at described RCC, the SCC that wherein said busy receiver is responsible for is the SCC with described RCC same frequency, and described SCC is the SCC with described RCC same frequency.
12. method according to claim 10 is characterized in that, described UE comprises a receiver; The CC of described RCC and described source base station is continuous; Described UE keeps the communication with described source base station, and comprises in the step of described RCC initiation random access procedure:
Described UE keeps the communication with described source base station, uses the spread bandwidth of described receiver, initiates random access procedure by the SCC that disconnects in the described source base station with described target BS same frequency at described RCC.
13. method according to claim 1 is characterized in that,, also comprises after described UE sends the switching command step at described source base station:
The SCC that described source base station stops to dispatch or deexcitation need disconnect.
14. method according to claim 13 is characterized in that, also comprises:
Described source base station receives the handoff failure order of described UE, begins to dispatch or activate the described described SCC that needs disconnection.
15. the base station of a random access system comprises source base station and target BS, it is characterized in that,
Described target BS comprises:
First receiver module is used to receive the handoff request message that described source base station sends;
Determination module is used for determining the at random access component carrier RCC of UE on described target BS;
First sending module is used for sending handover request ack message to described source base station, and described handover request ack message comprises the random access resource information on described RCC information and the described RCC;
Described source base station comprises:
Second sending module is used for sending handoff request message to described target BS;
Second receiver module is used to receive described handover request ack message, and sends switching command to described UE, notifies the communication of described UE protection with described source base station, and initiates random access procedure at described RCC.
16. base station according to claim 15 is characterized in that, described handoff request message is drawn together the PCC information and/or the auxilliary component carrier SCC information of the described current use of described UE; Described determination module is used for determining the described RCC of described UE on described target BS according to described PCC information and/or described SCC information.
17. base station according to claim 16 is characterized in that, described determination module comprises:
First determination module is used for determining that the described RCC of described UE on described target BS is the described PCC that using with described UE and the component carrier CC of described SCC different frequency;
And/or,
Second determination module is used for determining that the RCC of described UE on described target BS is for assisting the CC of component carrier SCC same frequency with described source base station.
18. the user equipment (UE) of a random access system is characterized in that, comprising: the order receiver module, be used for the switching command that the reception sources base station sends, described switching command comprises the component carrier of the access at random RCC information of target BS;
Handover module is used to keep the communication with described source base station, and initiates random access procedure at the RCC of described target BS.
19. UE according to claim 18 is characterized in that, described handover module comprises: the Random Access Channel RACH module of enhancing is used to keep the communication with described source base station, and directly initiates random access procedure at described RCC;
And/or,
A plurality of receivers are used to keep the communication with described source base station, use at least one in described a plurality of receiver, initiate random access procedure at described RCC.
20. UE according to claim 18 is characterized in that, described handover module comprises:
A receiver is used at the SCC of described source base station and the RCC consecutive hours of target BS, keeps the communication with described source base station, uses the spread bandwidth of described receiver, by disconnecting described SCC or directly initiating random access procedure at described RCC.
21. a random access system is characterized in that, comprising:
According to each described base station of claim 15 to 17;
According to each described UE of claim 18 to 20.
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