CN109429323B - Method, device and system for activating and deactivating synchronization of transmission time interval-B (TTI-B) - Google Patents

Method, device and system for activating and deactivating synchronization of transmission time interval-B (TTI-B) Download PDF

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CN109429323B
CN109429323B CN201710520766.6A CN201710520766A CN109429323B CN 109429323 B CN109429323 B CN 109429323B CN 201710520766 A CN201710520766 A CN 201710520766A CN 109429323 B CN109429323 B CN 109429323B
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tti
terminal
base station
timer
cell
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CN109429323A (en
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张志荣
刘悦
张光辉
朱雪田
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes

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Abstract

The invention discloses a method, a device and a system for synchronizing activation and deactivation of TTI-B, and relates to the field of LTE. The method comprises the following steps: a base station sends an RRC connection reconfiguration message to a terminal, wherein the RRC connection reconfiguration message carries a TTI-B state conversion cell; the base station stops the uplink scheduling of the terminal and starts a timer; during the running period of the timer, the base station and the terminal configure the state parameters according to the TTI-B state transition information element; and after the timer is overtime, the base station activates or deactivates the TTI-B function according to the configured state parameters after recovering the uplink scheduling of the terminal. The invention can quickly realize the activation and deactivation of the TTI-B function, overcomes the problems of VoLTE call drop, interference lifting and the like caused by complicated signaling, long TTI-B activation time and easy random access failure of the switching method in the cell, can realize the synchronization of the TTI-B activation and deactivation between the base station and the terminal, and finally improves the user experience of the VoLTE.

Description

Method, device and system for activating and deactivating synchronization of transmission time interval-B (TTI-B)
Technical Field
The invention relates to the field of LTE (Long Term Evolution, 3 GPP), in particular to a method, a device and a system for synchronization activation and deactivation of TTI-B (Transmission Time Interval Bundling).
Background
A Voice over Long Term Evolution (3 GPP) user is seriously damaged at a cell edge or a channel, and under a coverage limitation condition, a terminal cannot meet a Block Error rate (BLER Rat) requirement for data transmission within one TTI due to limitation of transmission power of the terminal. Therefore, the TTI-B concept is proposed in VoLTE, a plurality of uplink continuous TTIs are bound and distributed to the same terminal, the success rate of data decoding can be improved, the uplink coverage range of VoLTE is improved, and therefore the user experience of VoLTE is improved.
When activating and deactivating the TTI-B function based on an RRC (Radio Resource Control) connection reconfiguration message, there is a problem of terminal/base station synchronization, and manufacturers propose a conventional method for activating and deactivating TTI-B based on intra-cell handover for the synchronization problem. The core idea is to introduce intra-cell handover and random access procedures to avoid uncertainty during activation and deactivation of TTI-B and ensure synchronization between the terminal and the base station.
However, the TTI-B method based on intra-cell handover activation and deactivation has the following problems: firstly, the activation and deactivation time delay is increased, the intra-cell switching method has switching and random access processes, resources are consumed, the activation and deactivation processes are complex, the activation and deactivation process time delay is large, the intra-cell switching is generally 50 ms-60 ms, the activation speed is slow, and the VoLTE experience of edge users is influenced. Second, signaling overhead is increased, a random access procedure is increased based on an intra-cell handover method, and signaling overhead of MSG1, MSG2, MSG3 and MSG4 is increased in the random access procedure, thereby causing excessive consumption of signaling resources of a base station. Third, the dropped call rate of the VoLTE is increased, and due to the fact that the situation of switching failure or random access failure occurs in the switching and random access processes, the dropped call problem of the VoLTE telephone can be caused under the situation, so that the dropped call rate of the VoLTE is increased, and the user experience of the VoLTE is seriously influenced. Fourthly, interference is caused by random access failure, the terminal can continuously raise the transmitting power due to the random access failure, and the interference to other terminals can be caused by the increase of the transmitting power.
Then some manufacturers propose a non-intra-cell switching method, only the RRC connection reconfiguration message is used as a reference to activate and deactivate the TTI-B, and the problem that the terminal/base station is asynchronous is found out through a VoLTE test. For example, when the terminal receives the TTI-B reconfiguration signaling cannot be determined in time, and how long the terminal needs to successfully configure the TTI-B is not determined, 3GPP only specifies that the maximum time between correctly receiving the TTI-B reconfiguration signaling and sending the RRC connection reconfiguration complete message is 15 ms. After the base station transmits the RRC reconfiguration message, the terminal may receive the RRC reconfiguration message correctly only after retransmitting the RRC reconfiguration message for a plurality of times due to a radio link problem. After the terminal correctly receives the message, the terminal starts to configure the TTI-B enabling parameters until the TTI-B is configured or activated, and because the time spent by the terminals with different performances is short or uncertain, the base station cannot know how long the terminal particularly spends to configure or activate the TTI-B. After TTI-B is configured successfully, the terminal enters TTI-B mode immediately, and the base station does not know which mode to adopt between the RRC connection reconfiguration message and the RRC connection reconfiguration completion message after the RRC connection reconfiguration message is sent, namely the base station does not know whether Normal (non-TTI-B, conventional) mode or TTI-B mode is adopted to receive data. In addition, the TTI-B state between the terminal and the base station is out of synchronization, which causes the base station to demodulate data incorrectly and discard the data, and finally causes the packet loss of the VoLTE user to increase, the delay to increase, the MOS to deteriorate, and the user experience to be seriously affected.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method, a device and a system for TTI-B activation and deactivation synchronization, which can realize the TTI-B activation and deactivation synchronization between a base station and a terminal.
According to an aspect of the present invention, a method for TTI-B activation and deactivation synchronization in transmission time interval bundling is provided, including: a base station sends a Radio Resource Control (RRC) connection reconfiguration message to a terminal, wherein the RRC connection reconfiguration message carries a transmission time interval-B (TTI-B) state conversion cell; the base station stops the uplink scheduling of the terminal and starts a timer; during the running period of the timer, the base station and the terminal configure the state parameters according to the TTI-B state transition information element; and after the timer is overtime, the base station activates or deactivates the TTI-B function according to the configured state parameters after recovering the uplink scheduling of the terminal.
Further, after the timer expires, the method further includes: and responding to an uplink scheduling request sent by the terminal, and sending uplink scheduling authorization information to the terminal by the base station so that the terminal sends uplink data according to the configured state parameters.
Further, before the timer expires, the method includes: and responding to the uplink scheduling request sent by the terminal, and the base station does not send uplink scheduling authorization information to the terminal.
Further, the TTI-B state transition information element comprises a TTI-B enabling information element or a TTI-B non-enabling information element; during the running period of the timer, the base station and the terminal configure TTI-B parameters according to the TTI-B enabling information element, and after the timer is overtime, the base station resumes the uplink scheduling of the terminal and activates the TTI-B function; or during the running period of the timer, the base station and the terminal configure non-TTI-B parameters according to the TTI-B non-enabled information element, and after the timer is overtime, the base station restores the uplink scheduling of the terminal and then deactivates the TTI-B function.
According to another aspect of the present invention, a method for TTI-B activation and deactivation synchronization is further provided, including: the method comprises the steps that a terminal receives a Radio Resource Control (RRC) connection reconfiguration message sent by a base station, wherein the RRC connection reconfiguration message carries a transmission time interval-B (TTI-B) state conversion cell, and after the base station sends the RRC connection reconfiguration message, the base station stops uplink scheduling of the terminal and starts a timer; during the running period of the timer, the terminal and the base station configure the state parameters according to the TTI-B state transition information element; and after the timer is overtime, responding to the uplink scheduling authorization information sent by the base station, and sending uplink data by the terminal according to the configured state parameters.
Further, during the running of the timer, the method further comprises the following steps: and the terminal clears the first hybrid automatic repeat request HARQ process according to the TTI-B state transition information element and prepares a second HARQ process.
Further, during the running of the timer, the method further comprises the following steps: and the terminal activates or deactivates the TTI-B function according to the TTI-B state transition information element.
Further, the TTI-B state transition information element comprises a TTI-B enabling information element or a TTI-B non-enabling information element; during the running period of the timer, the terminal and the base station configure TTI-B parameters according to the TTI-B enabling information element, and after the timer is overtime, the terminal responds to uplink scheduling authorization information sent by the base station and sends uplink data in a TTI-B mode; or during the running period of the timer, the terminal and the base station configure non-TTI-B parameters according to the TTI-B non-enabled information element, and after the timer is overtime, the terminal responds to the uplink scheduling authorization information sent by the base station and sends uplink data in a non-TTI-B mode.
According to another aspect of the present invention, there is also provided a base station, including: a connection reconfiguration message sending unit, configured to send a radio resource control RRC connection reconfiguration message to the terminal, where the RRC connection reconfiguration message carries a TTI-B state transition cell; an uplink scheduling stopping unit, configured to stop uplink scheduling of the terminal; the timer starting unit is used for starting the timer; the base station side state parameter configuration unit is used for configuring the state parameters according to the TTI-B state conversion cell during the running period of the timer; the uplink scheduling recovery unit is used for recovering the uplink scheduling of the terminal after the timer is overtime; a TTI-B activation unit at the base station side, which is used for activating or deactivating the TTI-B function according to the configured state parameter; wherein, during the timer running, the terminal configures the state parameter according to the TTI-B state transition information element.
Further, the base station further includes: and the authorization information issuing unit is used for responding to the uplink scheduling request sent by the terminal, and the base station sends uplink scheduling authorization information to the terminal so that the terminal can send uplink data according to the configured state parameters.
Further, the uplink scheduling stopping unit is further configured to not send the uplink scheduling grant information to the terminal in response to the uplink scheduling request sent by the terminal before the timer expires.
Further, the TTI-B state transition information element comprises a TTI-B enabling information element or a TTI-B non-enabling information element; the base station side state parameter configuration unit is used for configuring TTI-B parameters according to the TTI-B enabling information element during the running period of the timer; the uplink scheduling recovery unit is used for recovering the uplink scheduling of the terminal after the timer is overtime; the base station side TTI-B activation unit is used for activating the TTI-B function; or the base station side state parameter configuration unit is used for configuring non-TTI-B parameters according to the TTI-B non-enabled information element during the running period of the timer; the uplink scheduling recovery unit is used for recovering the uplink scheduling of the terminal after the timer is overtime; and the base station side TTI-B activation unit is used for deactivating the TTI-B function.
According to another aspect of the present invention, there is also provided a terminal, including: a connection reconfiguration message receiving unit, configured to receive a radio resource control RRC connection reconfiguration message sent by the base station, where the RRC connection reconfiguration message carries a TTI-B state transition cell, and after sending the RRC connection reconfiguration message, the base station stops uplink scheduling of the terminal and starts a timer; a terminal side state parameter configuration unit, which is used for configuring the state parameter according to the TTI-B state transition cell during the running period of the timer; an uplink data sending unit, configured to respond to the uplink scheduling authorization information sent by the base station after the timer expires, and send uplink data according to the configured state parameter; wherein, during the timer running, the base station configures the state parameters according to the TTI-B state transition information element.
Further, the terminal further includes: and the HARQ process processing unit is used for clearing the first hybrid automatic repeat request HARQ process according to the TTI-B state transition information element and preparing a second HARQ process.
Further, the terminal further includes: and the terminal side TTI-B activation unit is used for activating or deactivating the TTI-B function according to the TTI-B state transition information element during the running period of the timer.
Further, the TTI-B state transition information element comprises a TTI-B enabling information element or a TTI-B non-enabling information element; the terminal side state parameter configuration unit is used for configuring TTI-B parameters according to the TTI-B enabling information element during the running period of the timer; the uplink data sending unit is used for responding to the uplink scheduling authorization information sent by the base station after the timer is overtime and sending uplink data in a TTI-B mode; or the terminal side state parameter configuration unit is used for configuring non-TTI-B parameters according to the TTI-B non-enabled information element during the running period of the timer; and the uplink data sending unit is used for responding to the uplink scheduling authorization information sent by the base station after the timer is overtime and sending the uplink data in a non-TTI-B mode.
According to another aspect of the present invention, a system for TTI-B activation and deactivation synchronization is also provided, which includes the above base station and the above terminal.
According to another aspect of the present invention, there is also provided a system for TTI-B activation and deactivation synchronization, comprising: a memory; and a processor coupled to the memory, the processor configured to perform the method as described above based on instructions stored in the memory.
According to another aspect of the present invention, a computer-readable storage medium is also proposed, on which computer program instructions are stored, which instructions, when executed by a processor, implement the steps of the above-described method.
Compared with the prior art, after the base station sends the RRC connection reconfiguration message to the terminal, the uplink scheduling of the terminal is stopped, the timer is started, the terminal and the base station complete the state parameter configuration during the running period of the timer, and after the timer is overtime, the base station recovers the uplink scheduling of the terminal and activates or deactivates the TTI-B function according to the configured state parameter, so that the intra-cell switching and random access processes are not needed, the activation and deactivation of the TTI-B can be quickly realized, the problems of VoLTE call drop, interference lifting and the like caused by the fact that the intra-cell switching method is complex in signaling, the TTI-B activation time is long, and random access failure is easy to cause can be solved, the synchronization between the base station and the terminal can be realized, and the VoLTE user experience is finally improved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
The invention will be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
fig. 1 is a flowchart illustrating a method for activating and deactivating synchronization in TTI-B according to an embodiment of the present invention.
Fig. 2 is a flowchart illustrating a method for activating and deactivating synchronization according to another embodiment of the present invention.
FIG. 3 is a flowchart illustrating a method for TTI-B active synchronization according to an embodiment of the present invention.
FIG. 4 is a flowchart illustrating a method for TTI-B synchronization deactivation according to another embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of an embodiment of the terminal of the present invention.
FIG. 7 is a schematic structural diagram of a system for TTI-B synchronization deactivation according to an embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a system for TTI-B synchronization deactivation according to still another embodiment of the present invention.
FIG. 9 is a schematic structural diagram of a system for TTI-B synchronization deactivation according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
Fig. 1 is a flowchart illustrating an embodiment of a method for TTI-B synchronization activation and deactivation according to the present invention, which is performed by a base station.
In step 110, the base station sends an RRC connection reconfiguration message to the terminal, where the RRC connection reconfiguration message carries only TTI-B state transition information elements, such as TTI-B enabled information elements or TTI-B disabled information elements, but does not carry MobilityControlInfo information elements. The RRC connection reconfiguration message includes a field ttiBundling, which indicates that the terminal needs to switch to the TTI-B mode to transmit data; and ttiBundling, which indicates that the terminal needs to switch to a non-TTI-B mode to transmit data. The base station can determine whether to activate or deactivate the TTI-B function for the VoLTE user according to the transmission power margin reported by the terminal or the uplink channel quality.
In step 120, the base station stops uplink scheduling of the terminal and starts a timer. The base station adds a timer, and during the running period of the timer, even if the terminal has an SR (Scheduling Request) Request, the base station does not issue UL Grant (Uplink Grant) information to the terminal, so as to prevent the base station data decoding error caused by the asynchronous terminal transmission and base station receiving modes during Normal (non TTI-B and TTI-B conversion periods).
In step 130, during the timer running, the base station and the terminal configure the status parameters according to the TTI-B status transition information element. For example, if the TTI-B state transition cell is a TTI-B enabled cell, that is, ttiBundling is TRUE, the base station and the terminal respectively complete TTI-B parameter configuration, where the terminal does not prepare for intra-cell handover, clears a non-TTI-B HARQ (Hybrid Automatic Repeat Request) process, prepares a TTI-B HARQ process, and immediately activates a TTI-B function, but the base station does not immediately activate the TTI-B function. If the TTI-B state transition cell is a TTI-B non-enabled cell, that is, ttiBundling is FALSE, the base station and the terminal respectively complete non-TTI-B parameter configuration, where the terminal clears the TTI-B HARQ process, prepares for the non-TTI-B HARQ process, and immediately deactivates the TTI-B function, but the base station does not immediately deactivate the TTI-B function.
In step 140, after the timer expires, the base station activates or deactivates the TTI-B function according to the configured status parameter after resuming the uplink scheduling of the terminal. For example, if the status parameter is a TTI-B enabled cell, the base station activates the TTI-B function, when the terminal has an SR request, the base station sends an UL Grant response to the terminal, and the terminal sends uplink data in a TTI-B manner, where the uplink data may include voice data and an RRC configuration complete message. If the state parameter is a TTI-B non-enabled cell, the base station deactivates the TTI-B function (i.e. activates Normal mode), when the terminal has an SR request, the base station sends a UL Grant response to the terminal, and the terminal sends uplink data in a non-TTI-B (i.e. Normal) mode.
In the embodiment, after the base station sends the RRC connection reconfiguration message to the terminal, the uplink scheduling of the terminal is stopped and the timer is started, the terminal and the base station complete the state parameter configuration during the running period of the timer, and after the timer is overtime, the base station activates or deactivates the TTI-B function according to the configured state parameters after recovering the uplink scheduling of the terminal, so that the intra-cell switching and random access processes are not needed, the activation and deactivation of the TTI-B function can be quickly realized, the problems of VoLTE call drop, interference lifting and the like caused by the fact that the intra-cell switching method is complex in signaling, the TTI-B activation time is long, and random access failure is easy to cause can be solved, the synchronization between the base station and the terminal can be realized, and the VoLTE user experience is finally improved.
Fig. 2 is a flowchart illustrating another embodiment of a TTI-B synchronization activation and deactivation method according to the present invention, which is executed by a terminal.
In step 210, the terminal receives an RRC connection reconfiguration message sent by the base station, where the RRC connection reconfiguration message carries a TTI-B state transition information element, such as a TTI-B enabled information element or a TTI-B disabled information element, but does not carry a MobilityControlInfo information element. And after the base station sends the RRC reconfiguration message, stopping uplink scheduling of the terminal and starting a timer.
In step 220, during the timer running, the terminal and the base station configure the status parameters according to the TTI-B status transition information element. In addition, the terminal also clears the first HARQ process according to the TTI-B state transition information element and prepares a second HARQ process. For example, if the TTI-B state transition cell is a TTI-B enabled cell, the base station and the terminal each complete TTI-B parameter configuration, where the terminal does not make intra-cell handover preparation, clears the non-TTI-B HARQ process, prepares the TTI-B HARQ process, and immediately activates the TTI-B function, but the base station does not immediately activate the TTI-B function. If the TTI-B state transition cell is a TTI-B non-enabled cell, the base station and the terminal respectively complete non-TTI-B parameter configuration, the terminal clears TTI-B HARQ process, prepares non-TTI-B HARQ process, and immediately deactivates TTI-B function, but the base station does not immediately deactivate TTI-B function.
During the running period of the timer, even if the terminal has an SR request, the base station does not issue the UL Grant to the terminal, so that the problem that the data decoding error of the base station is caused by the asynchronous transmission mode and the asynchronous receiving mode of the terminal during the Normal and TTI-B conversion period is prevented.
In step 230, after the timer expires, in response to the uplink scheduling grant information sent by the base station, the terminal sends uplink data according to the configured status parameter. After the timer is overtime, the terminal and the base station are marked to be configured with the state parameters, and the base station activates or deactivates the TTI-B function according to the configured state parameters after recovering the uplink scheduling of the terminal. For example, if the status parameter is a TTI-B enabled cell, the base station activates the TTI-B function, when the terminal has an SR request, the base station sends an UL Grant response to the terminal, and the terminal sends uplink data in a TTI-B manner, where the uplink data may include voice data and an RRC configuration complete message. And if the state parameter is a TTI-B non-enabled cell, the base station deactivates the TTI-B function, when the terminal has an SR request, the base station sends an UL Grant response to the terminal, and the terminal sends uplink data in a non-TTI-B mode.
In the embodiment, the terminal receives an RRC connection reconfiguration message sent by the base station, wherein after the RRC connection reconfiguration message is sent by the base station, the base station stops uplink scheduling of the terminal and starts a timer, which can prevent a base station data decoding error caused by asynchronous terminal transmission/base station reception modes during Normal and TTI-B transition periods. The method can enable the TTI-B to take effect quickly when the cell edge or the channel is seriously damaged, quickly improve the voice quality of the VoLTE user, and overcome the defects of complex realization, low conversion speed, failed switching and the like of the traditional method.
FIG. 3 is a flowchart illustrating a method for TTI-B active synchronization according to an embodiment of the present invention.
In the non-TTI-B state, steps 310 to 340 are performed.
In step 310, the terminal transmits an SR request to the base station.
In step 320, the base station returns an uplink scheduling Grant UL Grant response to the terminal.
In step 330, the terminal transmits uplink data to the base station in a non-TTI-b (normal) manner.
In step 340, the base station returns an ACK (acknowledgement) or NACK (non-acknowledgement) response to the terminal.
When the transmission power margin reported by the VoLTE user is not limited to be limited or when the uplink channel quality of the VoLTE user is generally poor, steps 350-390 are executed.
In step 350, the base station sends an RRC connection reconfiguration message to the terminal, where the RRC connection reconfiguration message carries a TTI-B enable cell, that is, ttiBundling TRUR, but does not carry a MobilityControlInfo cell.
In step 360, the base station stops uplink scheduling of the terminal and starts a timer.
In step 370, the terminal transmits an SR request to the base station. Since the base station stops the uplink scheduling of the terminal in step 360, the base station does not issue the UL Grant to the terminal even if the terminal has an SR request.
In step 380, the terminal configures TTI-B parameters and activates TTI-B functions. The terminal may also clear the Normal HARQ process and prepare the TTI-B HARQ process.
In step 381, the base station configures TTI-B parameters but does not activate TTI-B functionality.
The steps 380 and 381 can be executed at the same time without being sequential.
In step 390, after the timer expires, the base station first resumes the uplink scheduling for the terminal and then activates the TTI-B function.
In the TTI-B state, steps 3100 to 3140 are performed.
In step 3100, the terminal transmits an SR request to the base station.
In step 3110, the base station returns an UL Grant response to the terminal.
In step 3120, the terminal transmits an RRC configuration complete message to the base station in TTI-B.
In step 3130, the terminal transmits uplink data to the base station in the TTI-B manner.
In step 3140, the base station returns an acknowledgement or non-acknowledgement response to the terminal.
In the embodiment, during the running period of the timer, the base station stops the uplink scheduling of the terminal, so that the data decoding error of the data base station caused by the asynchronous transmission mode and the asynchronous receiving mode of the base station during the period of Normal conversion to TTI-B can be prevented, and meanwhile, because intra-cell switching and random access procedures are not needed, the resource consumption is reduced.
FIG. 4 is a flowchart illustrating a method for TTI-B synchronization deactivation according to another embodiment of the present invention.
In the TTI-B state, steps 410 to 440 are performed.
In step 410, the terminal transmits an SR request to the base station.
In step 420, the base station returns an UL Grant response to the terminal.
In step 430, the terminal transmits uplink data to the base station in a TTI-B manner.
In step 440, the base station returns an acknowledgement or non-acknowledgement response to the terminal.
And when the transmission power margin reported by the VoLTE user is not limited or the uplink channel quality of the VoLTE user is poor to be general, executing steps 450-490.
In step 450, the base station sends an RRC connection reconfiguration message to the terminal, where the RRC connection reconfiguration message carries the TTI-B non-enabled cell, that is, TTI-B is FALSE, but does not carry the MobilityControlInfo cell.
In step 460, the base station stops uplink scheduling of the terminal and starts a timer.
In step 470, the terminal transmits an SR request to the base station. Since the base station stops the uplink scheduling of the terminal in step 460, the base station does not issue the UL Grant to the terminal even if the terminal has an SR request.
In step 480, the terminal configures a Normal parameter and activates Normal. The terminal may also clear the TTI-B HARQ process and prepare a Normal HARQ process.
In step 481, the base station configures the Normal parameter but does not activate Normal.
The steps 480 and 481 can be performed simultaneously without any sequence.
After the timer expires, the base station first resumes uplink scheduling for the terminal and then activates Normal in step 490.
In the non-TTI-B state, steps 4100 to 4140 are performed.
In step 4100, the terminal transmits an SR request to the base station.
In step 4110, the base station returns an UL Grant response to the terminal.
In step 4120, the terminal transmits an RRC configuration complete message to the base station in a Normal manner.
In step 4130, the terminal transmits uplink data to the base station in a Normal manner.
In step 4140, the base station returns an acknowledgement or non-acknowledgement response to the terminal.
In this embodiment, during the timer running period, the base station stops the uplink scheduling of the terminal, which can prevent the data decoding error of the data base station caused by the asynchronous transmission and reception modes of the terminal during the TTI-B to Normal conversion period, and at the same time, because intra-cell handover and random access procedures are not required, the resource consumption is reduced.
In another embodiment of the invention, when the transmission power margin reported by the VoLTE user is not limited to be limited or when the quality of the uplink channel of the VoLTE user is generally poor, the terminal reads the RRC connection reconfiguration message sent by the base station, and if the RRC connection reconfiguration message includes TTI-B enable and has a trigger switching flag, that is, includes a MobilityControlInfo cell, the terminal is compatible with the conventional TTI-B activation method; if the RRC connection reconfiguration message includes TTI-B enabled and does not trigger a handover flag, i.e. does not have a MobilityControlInfo information element, the method described in fig. 3 is performed. When the transmitting power margin reported by a VoLTE user is not limited or when the quality of an uplink channel of the VoLTE user is poor to be general, a terminal reads an RRC connection reconfiguration message sent by a base station, and if the RRC connection reconfiguration message comprises a TTI-B incapability and a trigger switching mark, namely a MobilityControlInfo cell, the RRC connection reconfiguration message is compatible with a traditional TTI-B deactivation method; if the RRC connection reconfiguration message includes TTI-B not enabled and no handover trigger flag, i.e. no MobilityControlInfo information element, the method described in fig. 4 is performed.
The invention is not only suitable for FDD system, but also suitable for TDD system; in addition, because the modification of a retransmission mechanism is not involved, the method is simple to realize, is compatible with the existing setting of the existing network and is also compatible with the traditional method; moreover, the TTI-B activation and deactivation of the invention are fast effective, the conversion power is high, the voice quality of the edge user is improved as soon as possible, and the VoLTE user experience of the edge user is improved.
Fig. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention. The base station comprises a connection reconfiguration message sending unit 510, an uplink scheduling stopping unit 520, a timer starting unit 530, a base station side state parameter configuration unit 540, an uplink scheduling recovering unit 550 and a base station side TTI-B activating unit 560, wherein the uplink scheduling stopping unit 520, the timer starting unit 530, the base station side state parameter configuration unit 540, the uplink scheduling recovering unit 550 and the base station side TTI-B activating unit 560 can be integrated in a decision device of the base station.
The connection reconfiguration message sending unit 510 is configured to send an RRC connection reconfiguration message to the terminal, where the RRC connection reconfiguration message only carries a TTI-B state transition information element, such as a TTI-B enabled information element or a TTI-B disabled information element, but does not carry a MobilityControlInfo information element. The RRC connection reconfiguration message includes a field ttiBundling, which indicates that the terminal needs to switch to the TTI-B mode to transmit data; and ttiBundling, which indicates that the terminal needs to switch to a non-TTI-B mode to transmit data. The base station can determine whether to activate or deactivate the TTI-B function for the VoLTE user according to the transmission power margin reported by the terminal or the uplink channel quality.
Uplink scheduling stopping section 520 is configured to stop uplink scheduling of the terminal.
The timer starting unit 530 is used to start a timer. The base station adds a timer, and during the running period of the timer, even if the terminal has an SR request, the base station does not issue UL Grant information to the terminal, so as to prevent the base station data decoding error caused by asynchronous terminal sending and base station receiving modes during Normal and TTI-B conversion periods.
The base station side status parameter configuring unit 540 is configured to configure the status parameter according to the TTI-B status transition cell, for example, if the TTI-B status transition cell is a TTI-B enabled cell, that is, ttiBundling is TRUE, the base station completes TTI-B parameter configuration, and if the TTI-B status transition cell is a TTI-B disabled cell, that is, ttiBundling is FALSE, the base station completes non-TTI-B parameter configuration. Wherein, during the timer running, the terminal configures the state parameter according to the TTI-B state transition information element. When ttiBundling is TRUE, the terminal does not make intra-cell handover preparation, clears the non-TTI-B HARQ process, prepares the TTI-B HARQ process, and immediately activates the TTI-B function. And when ttiBundling is FALSE, the terminal clears the TTI-B HARQ process, prepares a non-TTI-B HARQ process and immediately deactivates the TTI-B function.
The uplink scheduling resuming unit 550 is configured to resume uplink scheduling for the terminal after the timer expires.
The base station side TTI-B activation unit 560 is configured to activate or deactivate a TTI-B function according to the configured status parameter.
In an embodiment, the base station may further include an authorization information issuing unit 570, where the authorization information issuing unit 570 is configured to, in response to an uplink scheduling request sent by the terminal, send uplink scheduling authorization information to the terminal, so that the terminal sends uplink data according to the configured state parameter. For example, if the status parameter is a TTI-B enabled cell, the base station activates the TTI-B function, when the terminal has an SR request, the base station sends an UL Grant response to the terminal, and the terminal sends uplink data in a TTI-B manner, where the uplink data may include voice data and an RRC configuration complete message. And if the state parameter is a TTI-B non-enabled cell, the base station deactivates the TTI-B function, when the terminal has an SR request, the base station sends an UL Grant response to the terminal, and the terminal sends uplink data in a non-TTI-B mode.
In the embodiment, after the base station sends the RRC connection reconfiguration message to the terminal, the uplink scheduling of the terminal is stopped and the timer is started, the terminal and the base station complete the state parameter configuration during the running period of the timer, and after the timer is overtime, the base station recovers the uplink scheduling of the terminal and activates or deactivates the TTI-B function according to the configured state parameter, so that the intra-cell switching and random access processes are not needed, the activation and deactivation of the TTI-B function can be quickly realized, the problems of VoLTE call drop, interference lifting and the like caused by the fact that the intra-cell switching method is complex in signaling, the TTI-B activation time is long, and random access failure is easy to cause can be solved, the synchronization between the base station and the terminal can be realized, and the VoLTE user experience is finally improved.
Fig. 6 is a schematic structural diagram of an embodiment of the terminal of the present invention. The terminal comprises a connection reconfiguration message receiving unit 610, a terminal side state parameter configuration unit 620 and an uplink data sending unit 630, wherein:
the connection reconfiguration message receiving unit 610 is configured to receive an RRC connection reconfiguration message sent by the base station, where the RRC connection reconfiguration message carries a TTI-B state transition information element, such as a TTI-B enabled information element or a TTI-B disabled information element, but does not carry a MobilityControlInfo information element. And after the base station sends the RRC reconfiguration message, stopping uplink scheduling of the terminal and starting a timer.
The terminal side status parameter configuring unit 620 is configured to configure the status parameters according to the TTI-B status transition information element during the timer running. For example, if the TTI-B state transition cell is a TTI-B enabled cell, the base station and the terminal each complete TTI-B parameter configuration. And if the TTI-B state conversion cell is a TTI-B non-enabled cell, the base station and the terminal respectively complete non-TTI-B parameter configuration.
In one embodiment, the terminal may further include a HARQ process processing unit 640 and a terminal-side TTI-B activation unit 650, the HARQ process processing unit 640 being configured to clear the first HARQ process and prepare the second HARQ process according to the TTI-B state transition information element. For example, if the TTI-B state transition cell is a TTI-B enabled cell, the terminal does not prepare for an intra-cell handover, clears the non-TTI-B HARQ process, prepares a TTI-B HARQ process, and the terminal-side TTI-B activation unit 650 is used to immediately activate the TTI-B function, but the base station does not immediately activate the TTI-B function. If the TTI-B state transition information element is a TTI-B non-enabled information element, the terminal clears the TTI-B HARQ process and prepares a non-TTI-B HARQ process, and the terminal side TTI-B activation unit 650 is used to immediately deactivate the TTI-B function, but the base station does not immediately deactivate the TTI-B function.
During the running period of the timer, even if the terminal has an SR request, the base station does not issue the UL Grant to the terminal, so that the problem that the data decoding error of the base station is caused by the asynchronous transmission mode and the asynchronous receiving mode of the terminal during the Normal and TTI-B conversion period is prevented.
The uplink data sending unit 630 is configured to send uplink data according to the configured state parameter in response to the uplink scheduling grant information sent by the base station after the timer expires. After the timer is overtime, the terminal and the base station are marked to be configured with the state parameters, and the base station restores the uplink scheduling of the terminal and activates or deactivates the TTI-B function according to the configured state parameters. For example, if the status parameter is a TTI-B enabled cell, the base station activates the TTI-B function, when the terminal has an SR request, the base station sends an UL Grant response to the terminal, and the terminal sends uplink data in a TTI-B manner, where the uplink data may include voice data and an RRC configuration complete message. And if the state parameter is a TTI-B non-enabled cell, the base station deactivates the TTI-B function, when the terminal has an SR request, the base station sends an UL Grant response to the terminal, and the terminal sends uplink data in a non-TTI-B mode.
In the embodiment, the terminal receives an RRC connection reconfiguration message sent by the base station, wherein after the RRC connection reconfiguration message is sent by the base station, the base station stops uplink scheduling of the terminal and starts a timer, which can prevent a base station data decoding error caused by asynchronous terminal transmission/base station reception modes during Normal and TTI-B transition periods. The method can enable the TTI-B to take effect quickly when the cell edge or the channel is seriously damaged, quickly improve the voice quality of the VoLTE user, and overcome the defects of complex realization, low conversion speed, failed switching and the like of the traditional method.
FIG. 7 is a schematic structural diagram of a system for TTI-B synchronization deactivation according to an embodiment of the present invention. The system includes a base station 710 and a terminal 720, wherein the base station 710 and the terminal 720 have been described in detail in the above embodiments. The base station 710 only carries TTI _ B activation or FALSE _ c _ t _ B deactivation in the RRC connection reconfiguration message, where TRUE indicates TTI _ B activation and FALSE indicates TTI _ B deactivation, and does not carry mobility control info information. In addition, a timer and a decision device can be added in the base station, and the decision device decides when to stop the uplink scheduling of the terminal and recover the uplink scheduling of the terminal; and determines when to start the timer at the base station side, and informs the decision device after the timer is overtime. The timer decides when to start the timer to work in the decision device, and the decision device is used after the timer is overtime; during the running period of the timer, the base station does not perform uplink scheduling on the terminal, so that the problem that the data decoding error of the base station is caused by the asynchronous transmission of the terminal and the receiving mode of the base station during the Normal and TTI-B conversion period is avoided.
The invention does not need intra-cell switching and random access processes, simplifies the complex process and reduces the resource consumption; in addition, the scheme can enable the TTI-B activation and deactivation to be effective quickly, the power is high, the voice quality of the edge user is improved as soon as possible, and the VoLTE user experience of the edge user is improved; the efficiency and the resource utilization rate of the VoLTE system can be improved; in addition, the scheme has no influence on the terminal, only needs software upgrade at the base station side, is simple to realize and has good backward compatibility and deployment feasibility.
Fig. 8 is a schematic structural diagram of a system for TTI-B synchronization deactivation according to still another embodiment of the present invention. The system includes a memory 810 and a processor 820. Wherein:
the memory 810 may be a magnetic disk, flash memory, or any other non-volatile storage medium. The memory is used to store instructions in the embodiments corresponding to fig. 1-4.
Processor 820 is coupled to memory 810 and may be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 820 is used for executing instructions stored in the memory, can quickly realize the functions of activating and deactivating the TTI-B, overcomes the problems of VoLTE call drop, interference lifting and the like caused by complicated signaling of an intra-cell switching method, long TTI-B activation time and easy random access failure, can realize the synchronization between a base station and a terminal, and finally improves the VoLTE user experience.
In one embodiment, as also shown in FIG. 9, the system 900 includes a memory 910 and a processor 920. Processor 920 is coupled to memory 910 by a BUS 930. The system 900 may also be coupled to an external storage device 950 via a storage interface 940 for facilitating retrieval of external data, and may also be coupled to a network or another computer system (not shown) via a network interface 960, which will not be described in detail herein.
In the embodiment, the data instruction is stored in the memory, and the instruction is processed by the processor, so that the TTI-B can take effect quickly when the cell edge or the channel is seriously damaged, the voice quality of the VoLTE user is improved quickly, and the defects that the traditional method is complex to realize, the switching speed is low, the switching failure can occur and the like are overcome.
In another embodiment, a computer-readable storage medium has stored thereon computer program instructions which, when executed by a processor, implement the steps of the method in the corresponding embodiment of fig. 1-4. As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Thus far, the present invention has been described in detail. Some details well known in the art have not been described in order to avoid obscuring the concepts of the present invention. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
The method and apparatus of the present invention may be implemented in a number of ways. For example, the methods and apparatus of the present invention may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically indicated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (17)

1. A method for transmission time interval bundling (TTI-B) activation and deactivation synchronization, comprising:
a base station sends a Radio Resource Control (RRC) connection reconfiguration message to a terminal, wherein the RRC connection reconfiguration message carries a Transmission Time Interval (TTI) -B state conversion cell, and the TTI-B state conversion cell comprises a TTI-B enabling cell or a TTI-B non-enabling cell;
the base station stops the uplink scheduling of the terminal and starts a timer;
during the running period of the timer, the base station and the terminal configure state parameters according to the TTI-B state transition cell, if the TTI-B state transition cell is a TTI-B enabling cell, the terminal immediately activates the TTI-B function, and if the TTI-B state transition cell is a TTI-B non-enabling cell, the terminal immediately deactivates the TTI-B function;
and after the timer is overtime, the base station activates or deactivates the TTI-B function according to the configured state parameters after recovering the uplink scheduling of the terminal.
2. The method of claim 1, further comprising, after the timer expires:
and responding to an uplink scheduling request sent by the terminal, and sending uplink scheduling authorization information to the terminal by the base station so that the terminal can send uplink data according to the configured state parameters.
3. The method of claim 1, prior to the timer expiring, comprising:
and responding to the uplink scheduling request sent by the terminal, wherein the base station does not send uplink scheduling authorization information to the terminal.
4. The method according to any one of claims 1 to 3,
during the running period of the timer, the base station and the terminal configure TTI-B parameters according to the TTI-B enabling information element, and after the timer is overtime, the base station resumes the uplink scheduling of the terminal and activates the TTI-B function;
or
And during the running period of the timer, the base station and the terminal configure non-TTI-B parameters according to the TTI-B non-enabled information element, and after the timer is overtime, the base station recovers the uplink scheduling of the terminal and then deactivates the TTI-B function.
5. A method for TTI-B activation and deactivation synchronization, comprising:
a terminal receives a Radio Resource Control (RRC) connection reconfiguration message sent by a base station, wherein the RRC connection reconfiguration message carries a Transmission Time Interval (TTI) -B state conversion cell which comprises a TTI-B enabling cell or a TTI-B non-enabling cell, and the base station stops uplink scheduling of the terminal and starts a timer after sending the RRC connection reconfiguration message;
during the running period of the timer, the terminal and the base station configure state parameters according to the TTI-B state transition cell, if the TTI-B state transition cell is a TTI-B enabling cell, the terminal immediately activates the TTI-B function, and if the TTI-B state transition cell is a TTI-B non-enabling cell, the terminal immediately deactivates the TTI-B function;
and after the timer is overtime, responding to the uplink scheduling authorization information sent by the base station, and sending uplink data by the terminal according to the configured state parameters.
6. The method of claim 5, further comprising, during the running of the timer:
and the terminal clears the first hybrid automatic repeat request HARQ process according to the TTI-B state transition cell and prepares a second HARQ process.
7. The method according to claim 5 or 6,
during the running period of the timer, the terminal and the base station configure TTI-B parameters according to the TTI-B enabling information element, and after the timer is overtime, the terminal responds to uplink scheduling authorization information sent by the base station and sends uplink data in a TTI-B mode;
or
And during the running period of the timer, the terminal and the base station configure non-TTI-B parameters according to the TTI-B non-enabled information element, and after the timer is overtime, the terminal responds to uplink scheduling authorization information sent by the base station and sends uplink data in a non-TTI-B mode.
8. A base station, comprising:
a connection reconfiguration message sending unit, configured to send a radio resource control RRC connection reconfiguration message to a terminal, where the RRC connection reconfiguration message carries a TTI-B state transition cell, and the TTI-B state transition cell includes a TTI-B enabled cell or a TTI-B disabled cell;
an uplink scheduling stopping unit, configured to stop uplink scheduling of the terminal;
the timer starting unit is used for starting the timer;
a base station side state parameter configuration unit, configured to configure a state parameter according to the TTI-B state transition cell during the operation of the timer, where if the TTI-B state transition cell is a TTI-B enabled cell, the terminal immediately activates a TTI-B function, and if the TTI-B state transition cell is a TTI-B disabled cell, the terminal immediately deactivates the TTI-B function;
an uplink scheduling recovery unit, configured to recover uplink scheduling for the terminal after the timer expires;
a TTI-B activation unit at the base station side, which is used for activating or deactivating the TTI-B function according to the configured state parameter;
wherein, during the running of the timer, the terminal configures the state parameter according to the TTI-B state transition information element.
9. The base station of claim 8, further comprising:
and the authorization information issuing unit is used for responding to the uplink scheduling request sent by the terminal, and the base station sends uplink scheduling authorization information to the terminal so that the terminal can send uplink data according to the configured state parameters.
10. The base station of claim 8,
the uplink scheduling stopping unit is further configured to respond to the uplink scheduling request sent by the terminal before the timer expires, and not send uplink scheduling authorization information to the terminal.
11. Base station according to any of claims 8-10,
the base station side state parameter configuration unit is used for configuring TTI-B parameters according to the TTI-B enabling information element during the running period of the timer;
the uplink scheduling recovery unit is used for recovering the uplink scheduling of the terminal after the timer is overtime;
the base station side TTI-B activation unit is used for activating a TTI-B function;
or
The base station side state parameter configuration unit is used for configuring non-TTI-B parameters according to the TTI-B non-enabled information element during the running period of the timer;
the uplink scheduling recovery unit is used for recovering the uplink scheduling of the terminal after the timer is overtime;
the base station side TTI-B activation unit is used for deactivating TTI-B function.
12. A terminal, comprising:
a connection reconfiguration message receiving unit, configured to receive a radio resource control RRC connection reconfiguration message sent by a base station, where the RRC connection reconfiguration message carries a TTI-B state transition cell, and the TTI-B state transition cell includes a TTI-B enabled cell or a TTI-B disabled cell, and after sending the RRC connection reconfiguration message, the base station stops uplink scheduling of the terminal and starts a timer;
a terminal side state parameter configuration unit, configured to configure state parameters according to the TTI-B state transition cell during the timer running period;
a terminal side TTI-B activation unit, configured to activate a TTI-B function immediately if the TTI-B state transition cell is a TTI-B enabled cell during operation of the timer, and deactivate the TTI-B function immediately if the TTI-B state transition cell is a TTI-B disabled cell;
an uplink data sending unit, configured to respond to the uplink scheduling authorization information sent by the base station after the timer expires, and send uplink data according to the configured state parameter;
wherein, during the timer running, the base station configures a state parameter according to the TTI-B state transition information element.
13. The terminal of claim 12, further comprising:
and the HARQ process processing unit is used for clearing the first hybrid automatic repeat request HARQ process according to the TTI-B state transition information element and preparing a second HARQ process.
14. The terminal according to claim 12 or 13,
the terminal side state parameter configuration unit is used for configuring TTI-B parameters according to the TTI-B enabling information element during the running period of the timer;
the uplink data sending unit is used for responding to the uplink scheduling authorization information sent by the base station after the timer is overtime and sending uplink data in a TTI-B mode;
or
The terminal side state parameter configuration unit is used for configuring non-TTI-B parameters according to the TTI-B non-enabled information element during the running period of the timer;
and the uplink data sending unit is used for responding to the uplink scheduling authorization information sent by the base station after the timer is overtime and sending uplink data in a non-TTI-B mode.
15. A system for TTI-B activation and deactivation synchronization, comprising a base station according to any of claims 8 to 11 and a terminal according to any of claims 12 to 14.
16. A system for TTI-B activation and deactivation synchronization, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the method of any of claims 1-7 based on instructions stored in the memory.
17. A computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the method of any one of claims 1 to 7.
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