CN109392091B - User terminal, paging message transmission method thereof, and computer-readable storage medium - Google Patents
User terminal, paging message transmission method thereof, and computer-readable storage medium Download PDFInfo
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Abstract
A user terminal and a paging message transmission method thereof, a computer readable storage medium, the paging message transmission method comprising: receiving a downlink control message issued by a base station, and acquiring a paging indication from the downlink control message; when detecting that a paged user terminal exists in a corresponding paging group, determining whether to perform an uplink random access process, including: when the uplink random access process is performed in the previous paging cycle and the optimal downlink wave beam is detected to be not changed, determining not to perform the uplink random access process; and receiving the paging message sent by the base station. The scheme can reduce the uplink resource overhead and reduce the probability of uplink access collision.
Description
Technical Field
The embodiment of the invention relates to the field of wireless communication, in particular to a user terminal, a paging message transmission method thereof and a computer readable storage medium.
Background
In a Long Term Evolution (LTE) system, when downlink data is transmitted to a user terminal in an IDLE (IDLE) state, a Mobility Management Entity (MME) transmits a paging message to all base stations (enbs) in all Tracking Areas (TAs) registered by a user. After receiving the paging message, if the idle user terminal finds itself called, it initiates a Radio Resource Control (RRC) connection establishment procedure to receive the call. If the user terminal finds itself not called, the user terminal discards the received paging message and enters a sleep state.
In 5G systems, the paging message is also transmitted by broadcast. In a multi-beam scenario, due to the mobility of the ue, the base station usually cannot know the optimal downlink beam on which the ue in an idle state and an inactive (inactive) state resides, so the base station cannot send a paging message on the optimal downlink beam corresponding to the ue, and can only transmit the same paging message on all beams by using a beam sweeping method. When there are many paging user terminals and the number of beams configured by the base station is large, the downlink overhead occupied by broadcasting and transmitting the paging signal by the beam frequency sweeping method is large.
In order to reduce downlink overhead, in the prior art, a base station performs Paging grouping on user terminals in an idle state and an inactive state, performs Paging Occasion (PO) distribution on the user terminals in different Paging groups, and indicates Paging situations of the user terminals in different Paging groups in a bitmap (bitmap) manner on each PO. When a certain paging group is paged, all user terminals in the paging group need to initiate an uplink random access process, and the problem of high uplink overhead exists.
Disclosure of Invention
The embodiment of the invention solves the problem of reducing the overhead of uplink resources in the transmission process of the paging message.
In order to solve the foregoing technical problem, an embodiment of the present invention provides a paging message transmission method, including: receiving a downlink control message issued by a base station, and acquiring a paging indication from the downlink control message; when detecting that a paged user terminal exists in a corresponding paging group, determining whether to perform an uplink random access process, including: when the uplink random access process is performed in the previous paging cycle and the optimal downlink wave beam is detected to be not changed, determining not to perform the uplink random access process; and receiving the paging message sent by the base station.
Optionally, the determining whether to perform the uplink random access process includes: and when the uplink random access process is performed in the previous paging cycle and the optimal downlink beam is changed, determining to perform the uplink random access process.
Optionally, after determining to perform the uplink random access procedure, the method further includes: and in the process of carrying out uplink random access, feeding back whether the optimal downlink wave beam changes and identification information of the optimal downlink wave beam to the base station.
Optionally, the determining whether to perform the uplink random access procedure further includes: and when the paging indication is monitored for the first time or the uplink random access process is not performed in the previous paging cycle, determining to perform the uplink random access process.
Optionally, the receiving the paging message sent by the base station includes: when the following conditions are met, receiving the paging message issued by the base station on the optimal downlink wave beam, wherein the optimal downlink wave beam is determined by the base station according to the information sent by the user terminal in the uplink random access process of the previous time; the conditions include: and performing an uplink random access process in the previous paging cycle but not being paged, and detecting that the optimal downlink beam is not changed.
Optionally, after receiving the paging message sent by the base station, the method further includes: matching the self identification information with the user terminal identification carried in the paging message; when the identification information of the user terminal is matched with the user terminal identification carried in the paging message, initiating an uplink random access process to be switched into a connected state and receiving downlink data; and when the identification information of the base station does not match with the user terminal identification carried in the paging message, discarding the paging message and receiving the downlink control message issued by the base station in the next paging cycle.
Optionally, the downlink control message sent by the base station further includes: resource information indicating a paging message; the receiving the paging message issued by the base station includes: and receiving the paging message issued by the base station by adopting the resource information of the paging message.
Optionally, after determining to perform the uplink random access procedure, the method further includes: when being paged, receiving a paging success indication message sent by a base station, switching to a connected state and receiving downlink data; and when the paging is not carried out, receiving the downlink control message sent by the base station in the next paging cycle.
Optionally, the downlink control message further includes: system information update indication information; the transmission method further comprises: and re-receiving the system message sent by the base station at the next system message modification period boundary.
Optionally, the following method is adopted to detect whether the optimal downlink beam changes: acquiring a current movement speed; when the current movement speed is lower than a preset speed, judging that the optimal downlink wave beam is not changed; and when the current movement speed is not less than the preset speed, judging that the optimal downlink wave beam changes.
An embodiment of the present invention provides a user terminal, including: a downlink control message receiving unit, configured to receive a downlink control message sent by a base station, and obtain a paging indicator from the downlink control message; a determining unit, configured to determine whether to perform an uplink random access procedure when detecting that there is a paged ue in a corresponding paging group, where the determining unit includes: when the uplink random access process is performed in the previous paging cycle and the optimal downlink wave beam is detected to be not changed, determining not to perform the uplink random access process; and the paging message receiving unit is used for receiving the paging message issued by the base station.
Optionally, the determining unit is configured to perform an uplink random access procedure in a previous paging cycle, and determine to perform the uplink random access procedure when the optimal downlink beam changes.
Optionally, the user terminal further includes: and the sending unit is used for feeding back whether the optimal downlink beam changes and identification information of the optimal downlink beam to the base station in the uplink random access process after the uplink random access process is determined.
Optionally, the determining unit is further configured to determine to perform the uplink random access procedure when the paging indication is monitored for the first time or the uplink random access procedure is not performed in a previous paging cycle.
Optionally, the paging message receiving unit is configured to receive, on the optimal downlink beam, a paging message issued by the base station, where the optimal downlink beam is determined by the base station according to information sent by a previous uplink random access process performed by the user terminal; the conditions include: and performing an uplink random access process in the previous paging cycle but not being paged, and detecting that the optimal downlink beam is not changed.
Optionally, the user terminal further includes: the first matching unit is used for matching the identification information with the user terminal identification carried in the paging message after receiving the paging message sent by the base station; when the identification information of the user terminal is matched with the user terminal identification carried in the paging message, initiating an uplink random access process to be switched into a connected state and receiving downlink data; and when the identification information of the base station does not match with the user terminal identification carried in the paging message, discarding the paging message and receiving the downlink control message issued by the base station in the next paging cycle.
Optionally, the downlink control message sent by the base station further includes: resource information indicating a paging message; the paging message receiving unit is configured to receive the paging message sent by the base station by using the resource information of the paging message.
Optionally, the user terminal further includes: a paging success indication message receiving unit, configured to receive a paging success indication message issued by a base station when being paged after determining to perform an uplink random access procedure, and switch to a connected state and receive downlink data; the downlink control message receiving unit is further configured to receive the downlink control message sent by the base station in a next paging cycle when the paging is not performed.
Optionally, the downlink control message further includes: system information update indication information; the user terminal further comprises: and the updating unit is used for re-receiving the system message sent by the base station at the next system message modification period boundary when the system message updating indication information is detected.
Optionally, the following method is adopted to detect whether the optimal downlink beam changes: acquiring a current movement speed; when the current movement speed is lower than a preset speed, judging that the optimal downlink wave beam is not changed; and when the current movement speed is not less than the preset speed, judging that the optimal downlink wave beam changes.
The embodiment of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed, the steps of any one of the above-mentioned paging message transmission methods are executed.
The embodiment of the invention also provides a user terminal, which comprises a memory and a processor, wherein the memory is stored with a computer instruction, and the computer instruction executes the steps of any one of the paging message transmission methods when running.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
when detecting that the paged user terminal exists in the paging group corresponding to the user terminal, the user terminal in the corresponding paging group does not directly perform the uplink random access process, but determines whether to perform the uplink random access process. When the user terminal performs the uplink random access process in the previous paging cycle and the current movement speed of the user terminal is less than the preset speed, the user terminal does not need to perform the uplink random access process, so that the overhead of uplink resources and the collision of uplink access can be reduced.
Drawings
Fig. 1 is a flowchart of a paging message transmission method in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a user terminal of a terminal according to an embodiment of the present invention.
Detailed Description
In 5G systems, the paging message is also transmitted by broadcast. In a multi-beam scenario, due to the mobility of the ue, the base station usually cannot know the optimal downlink beam on which the ue in idle (idle) state and inactive (inactive) state resides, so the base station cannot send a paging message on the optimal downlink beam corresponding to the ue, and can only transmit the same paging message on all beams by using a beam sweeping method. When there are many paging user terminals and the number of beams configured by the base station is large, the downlink overhead occupied by broadcasting and transmitting the paging signal by the beam frequency sweeping method is large.
In order to reduce the downlink resource overhead, one method is to transmit paging by a paging indication mechanism, and perform paging grouping on the user terminals in an inactive state and an idle state in the system, and the base station performs paging occasion distribution on the user terminals in different paging groups, and indicates the paging condition of the user terminals in different paging groups at each paging occasion, and the paging indication only indicates that some user terminals in the corresponding paging group are paged, but does not explicitly indicate which user terminal in the corresponding paging group is paged. When a certain user terminal in the paging group is paged, all the user terminals in the paging group need to perform an uplink random access process after receiving a paged paging indication, and report identification information of the user terminals. After receiving the identification information reported by the user terminal, the base station compares the identification information with the identification information of the user terminal in the core network paging, and if the identification information is the same as the identification information of the user terminal in the core network paging, the base station informs that the user terminal is the paged user terminal; if the two are different, the user terminal is informed that the paging is not carried out. For the user terminal which is not paged and initiates the uplink random access process, the uplink random access process is failed, and the more failed user terminals are, the more uplink resources are wasted, and the collision probability of uplink access is increased.
In the embodiment of the invention, when detecting that the paged user terminal exists in the paging group corresponding to the user terminal, the user terminal in the corresponding paging group does not directly perform the uplink random access process, but determines whether to perform the uplink random access process. The user terminal performs the uplink random access process in the previous paging cycle, and detects that the optimal downlink beam is not changed, the user terminal does not need to perform the uplink random access process, so that the overhead of uplink resources and the collision of uplink access can be reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
An embodiment of the present invention provides a method for transmitting a paging message, which is described in detail below with reference to fig. 1 through specific steps.
Step S101, receiving a downlink control message sent by a base station, and obtaining a paging indication from the downlink control message.
In a specific implementation, the base station may send a Downlink Control Information (DCI) to the ue. In the downlink control message, a Paging Indicator (PI) may be included. After receiving the downlink control message sent by the base station, the user terminal can obtain the paging indication from the received downlink control message.
In a specific implementation, the downlink control message may also carry resource information indicating a paging message. That is, when receiving the downlink control message sent by the base station, the user terminal can obtain the paging indication and the resource information indicating the paging message.
When the base station sends a Paging instruction to the user terminal through the downlink control message, the base station can scramble the downlink control message through a Paging Radio Network temporary Identity (P-RNTI) and send the downlink control message to the user terminal in a beam frequency sweeping mode.
Step S102, when detecting that the paged user terminal exists in the corresponding paging group, determining whether to perform an uplink random access process.
In a specific implementation, the ue may first obtain information such as Paging Group (PG) and PO corresponding to the ue. After receiving the PI sent by the base station, the user terminal may obtain the PI of the corresponding PG, for example, the PG may be indicated by a bit (bit) position in a PI bitmap.
In practical application, it can be known that the user terminal can obtain the PG corresponding to itself according to the identification information of itself. The process of obtaining the PG corresponding to the user terminal by the user terminal may refer to a scheme in the prior art, and details are not described here.
In specific implementation, the user terminal only needs to acquire the bit position of the corresponding PG in the PI bitmap, so that whether the paged user terminal exists in the corresponding PG can be known. According to the existing regulations, when the bit information of PG in PI bitmap is 0, it represents that no user terminal in PG is paged; and when the bit information of the PG in the PI bitmap is 1, the PG is indicated to have a user terminal to be paged.
For example, the PI bitmap includes 8 bits, corresponds to 8 PGs, and includes PG8, PG7, PG6, PG5, PG4, PG3, PG2, and PG1 in order from the upper bit to the lower bit. The PI field received by user terminal a is 01001010. When the paging group corresponding to the user terminal a is PG3, the bit information corresponding to PG3 is 0, which indicates that there is no paged user terminal in PG3 at this time. When the paging group corresponding to the user terminal a is PG2, the bit information corresponding to PG2 is 1, which indicates that there is a paged user terminal in PG2 at this time.
When there is no paged user terminal in the PG, all the user terminals in the PG do not need to perform the uplink random access process. When there is a paged user terminal in the PG, the user terminal needs to determine whether to perform an uplink random access procedure first, instead of performing the uplink random access procedure directly.
In a specific implementation, the ue may first determine whether an uplink random access procedure has been performed in a previous paging cycle. When the user terminal determines that the uplink random access process has been performed in the previous paging cycle, the user terminal may detect whether the optimal downlink beam is changed. When the uplink random access procedure is performed in the previous paging cycle and the optimal downlink beam of the user terminal is not changed, the user terminal may determine not to perform the uplink random access procedure.
In a specific implementation, it may be determined whether the ue a has performed the uplink random access procedure in the previous paging cycle by: when there is a ue paged in the paging group corresponding to the ue a in the previous paging cycle and the paged ue is not the ue a, it may be determined that the ue a has performed the uplink random access procedure.
In a specific implementation, after receiving a downlink control message issued by a base station, a user terminal may detect whether an optimal downlink beam corresponding to the user terminal changes. The user terminal may obtain the optimal downlink beam according to the received reference signal. The base station may obtain the optimal downlink beam corresponding to the user terminal according to information sent by the user terminal in the last uplink access process, for example, information such as a preamble and a resource used for sending the preamble.
In a specific implementation, during the uplink random access, the user terminal may feed back to the base station whether the optimal downlink beam changes and send its own identification information to the base station.
In the current paging cycle, when there is a paged user terminal in the paging group corresponding to the user terminal, because the base station already knows the identification information corresponding to the user terminal, the corresponding optimal downlink beam and whether the optimal downlink beam has changed or not in the uplink random access process last performed by the user terminal, if the optimal downlink beam of the user terminal has not changed, the user terminal does not need to execute the uplink random access process because: the base station needs to acquire the identification information of the user terminal, the optimal downlink beam and information such as whether the optimal downlink beam reported by the user terminal is changed, and the base station already acquires the identification information of the user terminal because the user terminal has previously performed uplink access; because the optimal downlink wave beam of the user terminal is not changed, the base station sends the paging message containing the user terminal identification on the acquired optimal downlink wave beam of the user terminal, the user terminal does not need to carry out an uplink random access process, and only needs to receive the corresponding paging message at the paging resource position indicated by the downlink control information.
In practical application, when the ue executes an uplink random access procedure, the identification information sent to the base station may be Serving temporary Mobile subscriber identity (S-TMSI) information of the ue.
In a specific implementation, when the ue detects that there is no paged ue in the corresponding paging group, the ue does not need to perform an uplink random access procedure.
For example, the paging group corresponding to the ue a is PG1, and no ue is paged in PG1 at the current PO time of the current paging cycle, so all ues in the paging group PG1 do not need to perform the uplink random access procedure.
In specific implementation, the user terminal may detect whether the optimal downlink beam corresponding to the user terminal changes according to the movement speed of the user terminal. The user terminal can obtain the current movement speed of the user terminal and compare the current movement speed with a preset speed. When the current movement speed is lower than the preset speed, the user terminal can judge that the corresponding optimal downlink beam is not changed; when the current movement speed is not less than the preset speed, the user terminal can determine that the optimal downlink beam corresponding to the user terminal changes.
In a specific implementation, the preset speed may be set according to an existing LTE protocol. In the existing LTE protocol, the moving speed of a user terminal is divided into a high-speed moving user terminal and a low-speed moving user terminal. Therefore, the preset speed in the embodiment of the present invention may divide the motion state of the UE by the boundary speed values of the high-speed motion and the low-speed motion.
In a specific implementation, when the ue performs the uplink random access procedure in the previous paging cycle and the ue is currently in a low-speed moving state or a static state, it is determined that the ue does not need to perform the uplink random access procedure, because:
in practical applications, it is known that when the ue is in a low-speed moving state or a static state, a wireless communication environment of the ue is usually stable, and an optimal downlink beam corresponding to the ue is usually not changed. When the user terminal performs the uplink random access process, the information such as the identification of the user terminal and whether the optimal downlink beam of the user terminal is changed can be sent to the base station. The base station can receive and store the identification information corresponding to the user terminal, and acquire the optimal downlink beam corresponding to the user terminal according to the information sent by the user terminal in the uplink random access process. Since the user terminal has already performed the uplink random access procedure in the previous paging cycle, the base station has already learned the identification information corresponding to the user terminal. When the base station confirms that the user terminal is in a low-speed motion state or a static state according to information such as whether the optimal downlink beam reported by the user terminal changes or not, the optimal downlink beam corresponding to the user terminal may not change, and the base station acquires the optimal downlink beam corresponding to the user terminal in the previous uplink random access process, and the base station only needs to send a paging message containing the user terminal identifier on the beam.
Step S103, receiving the paging message sent by the base station.
In a specific implementation, when the ue determines not to perform the uplink random access procedure, the ue may receive a paging message sent by the base station. Therefore, the user terminal finishes receiving the paging message sent by the base station.
In a specific implementation, when the base station issues the paging message to the user terminal, the base station may issue the paging message on a preset downlink beam. In the embodiment of the present invention, the preset downlink beam may be an optimal downlink beam corresponding to the user terminal.
As can be seen from step S102, when the ue determines not to perform the uplink random access procedure, the base station may obtain the optimal downlink beam corresponding to the ue when receiving information, such as a preamble, sent by the ue during the uplink random access procedure in the previous paging cycle. Therefore, in the current paging cycle, the base station may send the paging message containing the identification information of the corresponding user terminal to the user terminal on the optimal downlink beam corresponding to the user terminal acquired in the previous paging cycle.
For example, in step S102, the ue a performs the uplink random access procedure in the previous paging cycle, and the ue a is in a dormant state, so the ue a determines not to perform the uplink random access procedure. In the previous paging cycle, the base station learns that the optimal downlink beam corresponding to the user terminal a is beam1 according to the information such as the lead code and the resource sent in the uplink random access process of the user terminal a. In the current paging cycle, the base station transmits a paging message containing identification information of user terminal a at beam 1. And the user terminal A receives the paging message according to the resource position indicated by the received downlink control message.
In a specific implementation, after receiving a paging message sent by a base station, a user terminal may match its identification information with a user terminal identification carried in the paging message. When the user terminal detects that the identification information of the user terminal is matched with the user terminal identification carried in the paging message, the user terminal can carry out an uplink random access process. When the user terminal detects that the identification information of the user terminal is not matched with the user terminal identification carried in the paging message, the user terminal does not need to perform an uplink random access process.
In the prior art, when a paged user terminal exists in a paging group corresponding to the user terminal, all the user terminals in the corresponding paging group need to perform an uplink random access process. However, only one ue in the paging group may be the paged ue, and uplink resources occupied by other ues in the paging group during the uplink random access process are wasted, which also increases the probability of uplink access collision.
In the embodiment of the invention, when the paged user terminal exists in the paging group corresponding to the user terminal, the user terminal in the corresponding paging group does not directly perform the uplink random access process, but determines whether to perform the uplink random access process. And when the user terminal performs the uplink random access process in the previous paging cycle and detects that the optimal downlink beam is not changed, the user terminal does not need to perform the uplink random access process. Therefore, the paging message transmission method provided by the embodiment of the invention can effectively reduce the overhead of uplink resources and the collision probability of access.
In a specific implementation, when the ue has not performed the uplink random access procedure in the previous paging cycle, if there is a paged ue in the paging group corresponding to the ue, the ue may perform the uplink random access procedure. In the process of uplink random access, the user terminal feeds back whether the optimal downlink beam changes and identification information of the user terminal to the base station.
In a specific implementation, when the ue first listens to the paging indicator, it may be determined that the ue has not performed the uplink random access procedure before. When the ue does not monitor the paging indicator for the first time, if the ue monitors the paging indicator before but no ue is paged in the paging group corresponding to the monitored paging indicator before, it may also be determined that the ue has not performed the uplink random access procedure before.
For example, the user terminal a first monitors the paging indicator, and determines that the user terminal a has not performed the uplink random access procedure before.
For another example, the user terminal B hears the paging indication for the third time, and the paging group corresponding to the user terminal B is PG 2. In the paging indications of the previous two times monitored by the user terminal B, the paged user terminal does not indicate to exist in the paging group PG2, and therefore, it is determined that the user terminal B has not performed the uplink random access process before.
After receiving the identification information sent by the user terminal, the base station can match the received identification information of the user terminal with the identification information of the user terminal in the paging message sent by the core network. When the identification of the user terminal in the paging message sent by the core network is matched with the received identification information of the user terminal, the user terminal is judged to be paged currently. At this time, the base station may feed back a paging success indication message to the user terminal. And when receiving the paging success indication message, the user terminal is switched into a connected state and receives downlink data.
And when the identification of the user terminal in the paging message sent by the core network is not matched with the received identification information of the user terminal, judging that the user terminal is not paged. The user terminal receives the downlink control message sent by the base station in the next paging cycle and obtains the paging indication from the downlink control message.
In a specific implementation, for step S102, there is also a case where an optimal downlink beam of the user terminal is changed. For example, the ue is currently in a high-speed motion state, and the optimal downlink beam corresponding to the ue may be time-varying.
Therefore, in the embodiment of the present invention, when the ue detects that its own optimal downlink beam changes, the ue still needs to perform the uplink random access procedure even if the ue performs the uplink random access procedure in the previous paging cycle. And in the process of carrying out uplink random access, feeding back the change of the optimal downlink beam to the base station and sending identification information of the optimal downlink beam to the base station.
When the base station learns that the optimal downlink beam of the user terminal changes, the paging message sent to the user terminal does not need to include the identification information of the user terminal. Therefore, the downlink resource overhead of the base station can be reduced.
For example, the user terminal a is in a high-speed motion state, and the corresponding optimal downlink beam changes. When the base station knows that the optimal downlink beam of the user terminal A changes, the base station does not need to set the identification information corresponding to the user terminal A in the paging message.
And the user terminal feeds back whether the optimal downlink wave beam changes or not to the base station and sends self identification information to the base station in the process of uplink random access. After receiving the identification information sent by the user terminal, the base station can match the received identification information of the user terminal with the identification information of the user terminal in the paging message sent by the core network. When the identification of the user terminal in the paging message sent by the core network is matched with the received identification information of the user terminal, the user terminal is judged to be paged currently. At this time, the base station may feed back a paging success indication message to the user terminal. And when receiving the paging success indication message, the user terminal is switched into a connected state and receives downlink data.
And when the identification of the user terminal in the paging message sent by the core network is not matched with the received identification information of the user terminal, judging that the user terminal is not paged. The user terminal receives the downlink control message sent by the base station in the next paging cycle and obtains the paging indication from the downlink control message.
In a specific implementation, when the system message needs to be updated, the base station may further send system message update indication information to the user terminal. After receiving the system message update indication information sent by the base station, the user terminal receives the system message sent by the base station again in the next system message modification period, thereby realizing the update of the system message.
In practical application, the ue may re-receive the system message sent by the base station at the boundary where the next system message modification period starts. In other words, at the beginning of the next system message modification period, the ue re-receives the system message sent by the base station.
In a specific implementation, the base station may send system message update indication information to the user equipment through a downlink control message. That is to say, in the embodiment of the present invention, the base station may send, in the downlink control message, system message update indication information, a paging indication, and resource information indicating the paging message to the user terminal, that is, the base station multiplexes the downlink control message.
In the downlink control message, there may be 3 domains, which are an information indication domain, a PI domain, and a paging resource indication domain. When there is a system information update, the downlink control message may further include an updated system message.
In an embodiment of the present invention, the information indication field may occupy the first 2 bits in the downlink control message, the 1 st bit indicates whether the system message update indication information appears, and the 2 nd bit indicates whether the paging resource indication information appears. When the 1 st bit indicates that the system message update indication information exists, the 3 rd to x th bits are updated system messages. Taking the example that the PI is indicated by a bitmap mode, if the PI domain occupies 8 bits, when the system message update indication information exists, the bit position of the PI domain starts from the x +1 bit and ends at the x +9 bit; when there is no system message update indication information, the bit positions of the PI field are from the 3 rd bit to the 10 th bit. When the 2 nd bit indicates that the paging resource information appears, a paging resource indication domain exists, and the bit position is behind the bit position of the PI domain; when the 2 nd bit indicates that there is no paging resource information, there is no paging resource indication field.
It is to be understood that, in practical applications, the distribution of the information in the downlink control message may also adopt other distribution manners, and is not limited to the examples in the above embodiments of the present invention.
The following describes, by way of example, a paging message transmission method provided in the above-described embodiment of the present invention.
The base station is configured to have 32 POs in each paging cycle, which is fixedly divided into 8 PGs, so that the length of each PI bitmap is 8 bits. Each bit in the PI bitmap represents whether a user terminal is paged in the corresponding PG or not, and when the bit corresponding to the PG is 0, no user terminal is paged in the PG; when the bit corresponding to PG is 1, it indicates that there is a user terminal in PG to be paged. The positions of PG in bitmap from high order to low order are: PG8, PG7, PG6, PG5, PG4, PG3, PG2, PG 1.
There are 4 idle ues set on PO3, which are ue 1, ue 2, ue 3 and ue 4 in sequence. The 4 user terminals respectively calculate the PG to which the user terminals belong as follows: the paging group to which the user terminal 1 belongs is PG1, the paging group to which the user terminal 2 belongs is PG5, the paging group to which the user terminal 3 belongs is PG5, and the paging group to which the user terminal 4 belongs is PG 8. The motion states of the user terminal 1 and the user terminal 2 are static states, and the motion states of the user terminal 3 and the user terminal 4 are high-speed motion states.
The ues 1 to 4 monitor a Physical Downlink Control Channel (PDCCH) at the PO3 time in the first paging cycle. The PI field in the downlink control message received at PO3 in the first paging cycle is 01010001. According to the PI domain, it is known that there are user terminals in the paging groups PG1, PG5, and PG7 to be paged, and there are no user terminals in other paging groups to be paged.
The user terminals 1 to 4 monitor the PI for the first time, or no user terminal is paged in the corresponding paging group when the paging indication is monitored before. Since there are ues paged in PG1 and PG5, ue 1, ue 2, and ue 3 all perform the uplink random access procedure.
The user terminal 1, the user terminal 2 and the user terminal 3 respectively report the motion state of the user terminal to the base station while indicating the corresponding S-TMSI to the base station, wherein: the motion state reported by the user terminal 1 is static, the motion state reported by the user terminal 2 is static, and the motion state reported by the user terminal 3 is high-speed.
After receiving the S-TMSI sent by the user terminal 1 to the user terminal 3, the base station matches the S-TMSI with the paging message sent by the core network. In the paging message sent by the core network, only the S-TMSI corresponding to the user terminal 3 exists, so the base station feeds back a paging success indication to the user terminal 3, and the user terminal 3 switches from an idle state to a connected state and receives downlink data. The base station feeds back the paging failure indication to the user terminal 1 and the user terminal 2, and the user terminal 1 and the user terminal 2 continue to monitor and receive the downlink control message scrambled by the P-RNTI at the PO3 of the next paging cycle.
Since no ue in the paging group PG8 corresponding to the ue 4 is paged, the ue 4 listens again on PO3 of the next paging cycle and receives the downlink control message scrambled by the P-RNTI.
In the second paging cycle, the PI field received in the downlink control message at PO3 is 10010001. According to the PI domain, it is known that there are user terminals in the paging groups PG1, PG5, and PG8 to be paged, and there are no user terminals in other paging groups to be paged.
In the second paging cycle, user terminal 1 is paged as well as user terminal 4, and user terminal 2 is not paged.
Since at PO3 time in the first paging cycle, there is a ue in the paging group PG1 corresponding to ue 1 that is paged, but ue 1 is not paged, so that in the first paging cycle, ue 1 has already performed the uplink random access procedure. Therefore, the base station already stores the S-TMSI and the motion state corresponding to the user terminal 1.
Accordingly, since at the PO3 time in the first paging cycle, the ue 2 has been paged in the paging group PG5 corresponding to the ue 2, but the ue 2 has not been paged, the ue 2 has already performed the uplink random access procedure in the first paging cycle. Therefore, the base station already stores the S-TMSI and the motion state corresponding to the user terminal 2.
Since the motion states of the user terminal 1 and the user terminal 2 are static, the optimal downlink beam corresponding to the user terminal 1 and the optimal downlink beam corresponding to the user terminal 2 may not change.
When the user terminal 1 performs the uplink random access process in the first paging cycle, the base station learns that the optimal downlink beam corresponding to the user terminal 1 is beam 1. Thus, the base station transmits a paging message containing the identity of user terminal 1 on the downlink beam 1.
When the user terminal 2 performs the uplink random access process in the first paging cycle, the base station learns that the optimal downlink beam corresponding to the user terminal 2 is beam 2. Thus, the base station transmits a paging message containing the identity of user terminal 2 on the downlink beam 2.
The user terminal 1 and the user terminal 2 respectively monitor that the self-resident optimal downlink beam is not changed, and the user terminal 1 and the user terminal 2 respectively receive the paging message issued by the base station according to the information such as the resource position indicated by the downlink control message.
The user terminal 1 matches the self S-TMSI with the S-TMSI in the paging message, finds the S-TMSI matched with the self S-TMSI, and shows that the user terminal 1 is paged and the user terminal 1 performs an uplink random access process.
The user terminal 2 matches the self S-TMSI with the S-TMSI in the paging message, and does not find the S-TMSI matched with the self S-TMSI, so the user terminal 2 does not need to perform an uplink random access process. The user terminal 2 continues to listen and receive the P-RNTI scrambled downlink control message at PO3 in the next paging cycle.
When the user terminal 1 and the user terminal 2 monitor that the optimum downlink beam in which the user terminal 1 and the user terminal 2 reside changes, the user terminal 1 and the user terminal 2 do not need to receive paging messages, but respectively execute the uplink random access process again.
Since no ue is paged in the paging group PG8 corresponding to the ue 4 in the first paging cycle, the ue 4 does not perform the uplink random access procedure at the PO3 time of the first paging cycle. In the second paging cycle, the user terminal 4 is paged in the paging group PG8 corresponding to the user terminal 4, so that the user terminal 4 performs the uplink random access procedure. In the uplink random access process, the user terminal 4 reports its own S-TMSI to the base station, and simultaneously reports its own motion state as a high-speed motion state to the base station. When receiving the S-TMSI corresponding to the user terminal 4, the base station matches the S-TMSI with the called user terminal sent by the core network, finds that the S-TMSI corresponding to the user terminal 4 matches the S-TMSI of the called user terminal sent by the core network, and the paging is successful. At this time, the user terminal 4 enters the connected state from the idle state and receives the downlink data.
Referring to fig. 2, an embodiment of the present invention provides a user terminal 20, including: a downlink control message receiving unit 201, a determining unit 202 and a paging message receiving unit 203, wherein:
a downlink control message receiving unit 201, configured to receive a downlink control message sent by a base station, and obtain a paging indicator from the downlink control message;
a determining unit 202, configured to determine whether to perform an uplink random access procedure when detecting that there is a paged user equipment in a corresponding paging group, where the determining unit includes: when the uplink random access process is performed in the previous paging cycle and the optimal downlink wave beam is detected to be not changed, determining not to perform the uplink random access process;
a paging message receiving unit 203, configured to receive a paging message sent by the base station.
In a specific implementation, the determining unit 202 may be configured to perform an uplink random access procedure in a previous paging cycle, and determine to perform the uplink random access procedure when the optimal downlink beam changes.
In a specific implementation, the user terminal 20 may further include: a sending unit 204, configured to, after determining to perform an uplink random access process, feed back, to the base station, whether the optimal downlink beam changes and identification information of the optimal downlink beam during the uplink random access process.
In a specific implementation, the determining unit 202 may be further configured to determine to perform an uplink random access procedure when the paging indication is monitored for the first time and the uplink random access procedure has not been performed in a previous paging cycle.
In a specific implementation, the paging message receiving unit 203 is configured to receive, on the optimal downlink beam, a paging message issued by the base station, where the optimal downlink beam is determined by the base station according to information sent by a previous user terminal in an uplink random access process; the conditions include: and performing an uplink random access process in the previous paging cycle but not being paged, and detecting that the optimal downlink beam is not changed.
In a specific implementation, the ue may further include: a first matching unit (not shown in the figure), configured to match, after receiving the paging message sent by the base station, identification information of the first matching unit with an identifier of a user terminal carried in the paging message; when the identification information of the user terminal is matched with the user terminal identification carried in the paging message, initiating an uplink random access process to be switched into a connected state and receiving downlink data; and when the identification information of the paging message is not matched with the user terminal identification carried in the paging message, discarding the paging message and receiving a paging indication sent by the base station in the next paging cycle.
In a specific implementation, the downlink control message sent by the base station further includes: resource information indicating a paging message; the paging message receiving unit 203 may be configured to receive the paging message sent by the base station by using the resource information of the paging message.
In a specific implementation, the ue may further include: a paging success indication message receiving unit (not shown in the figure), configured to receive a paging success indication message sent by the base station when being paged after determining to perform the uplink random access procedure, and switch to a connected state and receive downlink data.
In a specific implementation, the downlink control message may further include: system information update indication information; the user terminal may further include: and an updating unit (not shown in the figure) configured to re-receive the system message sent by the base station at a next system message modification period boundary when the system message update indication information is detected.
In a specific implementation, the following method may be adopted to detect whether the optimal downlink beam changes: acquiring a current movement speed; when the current movement speed is lower than a preset speed, judging that the optimal downlink wave beam is not changed; and when the current movement speed is not less than the preset speed, judging that the optimal downlink wave beam changes.
The embodiment of the present invention provides a computer-readable storage medium, on which a computer instruction is stored, where the computer instruction executes the steps of the paging message transmission method provided in the above embodiment of the present invention when running, and details are not repeated here.
The embodiment of the present invention further provides another user terminal, which includes a memory and a processor, where the memory stores a computer instruction, and the computer instruction executes the steps of the paging message transmission method provided in the above embodiment of the present invention when running, and details are not repeated here.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by instructing the relevant hardware through a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (22)
1. A method for transmitting a paging message, comprising:
receiving a downlink control message issued by a base station, and acquiring a paging indication from the downlink control message;
when detecting that a paged user terminal exists in a corresponding paging group, determining whether to perform an uplink random access process, including: when the uplink random access process is performed in the previous paging cycle and the optimal downlink wave beam is detected to be not changed, determining not to perform the uplink random access process; detecting the existence of the paged user terminal in the corresponding paging group, comprising: acquiring a corresponding paging group and a paging occasion; after receiving a paging indication sent by a base station, acquiring a paging indication of a corresponding paging group; acquiring the bit position of the corresponding paging group in a paging indication bit map, and acquiring whether a paged user terminal exists in the corresponding paging group;
and receiving the paging message sent by the base station.
2. The paging message transmission method of claim 1, wherein the determining whether to perform an uplink random access procedure comprises:
and when the uplink random access process is performed in the previous paging cycle and the optimal downlink beam is changed, determining to perform the uplink random access process.
3. The paging message transmission method of claim 2, further comprising, after determining to perform an uplink random access procedure:
and in the process of carrying out uplink random access, feeding back whether the optimal downlink wave beam changes and identification information of the optimal downlink wave beam to the base station.
4. The paging message transmission method of claim 1, wherein the determining whether to perform an uplink random access procedure further comprises:
and when the paging indication is monitored for the first time or the uplink random access process is not performed in the previous paging cycle, determining to perform the uplink random access process.
5. The method for transmitting paging messages according to claim 1, wherein said receiving the paging message transmitted by the base station comprises:
when the following conditions are met, receiving the paging message issued by the base station on the optimal downlink wave beam, wherein the optimal downlink wave beam is determined by the base station according to the information sent by the user terminal in the uplink random access process of the previous time; the conditions include: and performing an uplink random access process in the previous paging cycle but not being paged, and detecting that the optimal downlink beam is not changed.
6. The method for transmitting paging messages according to claim 5, further comprising, after receiving the paging message transmitted by the base station:
matching the self identification information with the user terminal identification carried in the paging message;
when the identification information of the user terminal is matched with the user terminal identification carried in the paging message, initiating an uplink random access process to be switched into a connected state and receiving downlink data;
and when the identification information of the base station does not match with the user terminal identification carried in the paging message, discarding the paging message and receiving the downlink control message issued by the base station in the next paging cycle.
7. The method for transmitting paging messages according to claim 1, wherein the downlink control message transmitted by the base station further includes: resource information indicating a paging message; the receiving the paging message issued by the base station includes:
and receiving the paging message issued by the base station by adopting the resource information of the paging message.
8. The paging message transmission method of claim 1, further comprising, after determining to perform an uplink random access procedure:
when being paged, receiving a paging success indication message sent by a base station, switching to a connected state and receiving downlink data;
and when the paging is not carried out, receiving the downlink control message sent by the base station in the next paging cycle.
9. The paging message transmission method of claim 1, wherein the downlink control message further comprises: system information update indication information; the transmission method further comprises:
and when the system information updating indication information is detected, re-receiving the system information sent by the base station at the next system information modification period boundary.
10. The method for transmitting paging message according to any one of claims 1 to 9, characterized in that whether the optimal downlink beam is changed is detected by the following method:
acquiring a current movement speed;
when the current movement speed is lower than a preset speed, judging that the optimal downlink wave beam is not changed; and when the current movement speed is not less than the preset speed, judging that the optimal downlink wave beam changes.
11. A user terminal, comprising:
a downlink control message receiving unit, configured to receive a downlink control message sent by a base station, and obtain a paging indicator from the downlink control message;
a determining unit, configured to determine whether to perform an uplink random access procedure when detecting that there is a paged ue in a corresponding paging group, where the determining unit includes: when the uplink random access process is performed in the previous paging cycle and the optimal downlink wave beam is detected to be not changed, determining not to perform the uplink random access process; detecting the existence of the paged user terminal in the corresponding paging group, comprising: acquiring a corresponding paging group and a paging occasion; after receiving a paging indication sent by a base station, acquiring a paging indication of a corresponding paging group; acquiring the bit position of the corresponding paging group in a paging indication bit map, and acquiring whether a paged user terminal exists in the corresponding paging group;
and the paging message receiving unit is used for receiving the paging message issued by the base station.
12. The ue of claim 11, wherein the determining unit is configured to determine to perform the uplink random access procedure when the uplink random access procedure is performed in a previous paging cycle and the optimal downlink beam is changed.
13. The user terminal of claim 12, further comprising: and the sending unit is used for feeding back whether the optimal downlink beam changes and identification information of the optimal downlink beam to the base station in the uplink random access process after the uplink random access process is determined.
14. The ue of claim 11, wherein the determining unit is further configured to determine to perform an uplink random access procedure when the paging indicator is monitored for the first time or no uplink random access procedure has been performed in a previous paging cycle.
15. The ue according to claim 11, wherein the paging message receiving unit is configured to receive the paging message sent by the base station on the optimal downlink beam when the following condition is satisfied, where the optimal downlink beam is determined by the base station according to information sent in an uplink random access procedure performed by a previous ue; the conditions include: and performing an uplink random access process in the previous paging cycle but not being paged, and detecting that the optimal downlink beam is not changed.
16. The user terminal of claim 15, further comprising: the first matching unit is used for matching the identification information with the user terminal identification carried in the paging message after receiving the paging message sent by the base station; when the identification information of the user terminal is matched with the user terminal identification carried in the paging message, initiating an uplink random access process to be switched into a connected state and receiving downlink data; and when the identification information of the base station does not match with the user terminal identification carried in the paging message, discarding the paging message and receiving the downlink control message issued by the base station in the next paging cycle.
17. The ue of claim 11, wherein the downlink control message transmitted by the base station further comprises: resource information indicating a paging message; the paging message receiving unit is configured to receive the paging message sent by the base station by using the resource information of the paging message.
18. The user terminal of claim 11, further comprising: a paging success indication message receiving unit, configured to receive a paging success indication message issued by a base station when being paged after determining to perform an uplink random access procedure, and switch to a connected state and receive downlink data; the downlink control message receiving unit is further configured to receive the downlink control message sent by the base station in a next paging cycle when the paging is not performed.
19. The ue of claim 11, wherein the downlink control message further comprises: system information update indication information; the user terminal further comprises: and the updating unit is used for re-receiving the system message sent by the base station at the next system information modification period boundary when the system information updating indication information is detected.
20. The user equipment according to any of claims 11-19, wherein the following method is adopted to detect whether the optimal downlink beam is changed: acquiring a current movement speed; when the current movement speed is lower than a preset speed, judging that the optimal downlink wave beam is not changed; and when the current movement speed is not less than the preset speed, judging that the optimal downlink wave beam changes.
21. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the paging message transmission method according to any one of claims 1 to 10.
22. A user terminal comprising a memory and a processor, the memory having stored thereon a computer program, characterized in that the computer program, when executed by the processor, performs the steps of the paging message transmission method according to any one of claims 1 to 10.
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| KR102553888B1 (en) * | 2018-09-13 | 2023-07-11 | 삼성전자주식회사 | Method for controlling beam and electronic device thereof |
| CN112752341A (en) * | 2019-10-29 | 2021-05-04 | 中国移动通信有限公司研究院 | Paging detection and indication method, equipment and medium |
| US20230337182A1 (en) * | 2020-09-03 | 2023-10-19 | Beijing Xiaomi Mobile Software Co., Ltd. | Paging method and apparatus, and storage medium |
| WO2022236623A1 (en) * | 2021-05-10 | 2022-11-17 | 北京小米移动软件有限公司 | Paging method and apparatus therefor |
| CN116095830A (en) * | 2021-11-05 | 2023-05-09 | 华为技术有限公司 | Communication method and device |
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