WO2010034208A1

WO2010034208A1 - Method for processing uplink random access resources and equipment

Info

Publication number: WO2010034208A1
Application number: PCT/CN2009/072375
Authority: WO
Inventors: 苟伟; 毕峰
Original assignee: 中兴通讯股份有限公司
Priority date: 2008-09-25
Filing date: 2009-06-22
Publication date: 2010-04-01
Also published as: CN101686555A; CN101686555B

Abstract

A method and equipment for processing uplink random access resources are provided, which are applied to a communication system including a core network, a base station and a terminal. The method includes the following steps: the base station receives a reservation event notification message from the core network, sends the reservation event notification message to all terminals, and increases uplink random access resources, so that the terminal completes the uplink random access process. The present invention solves the problem of the prior art that the terminals could not access network to perform communication in time in preset condition, and decreases the congestion of network.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a method and an apparatus for processing an uplink random access resource. BACKGROUND ART In order to actively cope with natural disasters such as earthquakes and tsunami, an Earthquake and Tsunami Warning System (ETWS) is currently being considered. 1 is a structural block diagram of an ETWS according to the related art. As shown in FIG. 1, an ETWS is applied to a Public Land Mobile Network (PLMN), and an ETWS server (including an ETWS server 1 and an ETWS server 2) By using the ETWS to communicate with the base station through the service gateway, it is possible to timely transmit disaster-related information to users in the event of a natural disaster such as an earthquake or tsunami, thereby reducing the impact on natural humans such as earthquakes and tsunami. In the existing network environment, the emergency communication is not fully considered in the design, and the user access resources are usually designed to be limited. This leads to a sharp increase in the number of users who need to communicate in a short period of time after a natural disaster such as an earthquake and tsunami. The number of users requiring access to the network is often much larger than the number of users simultaneously designed to access the system. The user in the access network refers to the terminal in the idle state. The terminal in the idle state can only receive the information from the base station in downlink synchronization, but cannot initiate the uplink service because there is no uplink synchronization, but the earthquake tsunami After a natural disaster occurs, the terminal affected by the natural disaster needs to initiate the uplink service immediately. Therefore, all the terminals in the idle state need to do the uplink random access procedure first. According to the principle of random access, the terminal can access the random access. Sequence or different access resources to distinguish users. For ETWS, the number of machine access sequences is limited, and the number of resources accessed by the machine can be increased. In the normal state, the resources for random access are relatively small. However, if natural resources such as earthquake and tsunami are still less, the resources accessed by the machine are still relatively small, and the number of users requiring simultaneous uplink access increases sharply. The probability of a user colliding during the random access process increases, and the user cannot access the network for communication in time. SUMMARY OF THE INVENTION The present invention is directed to the problem in the prior art that a user may not be able to access the network for communication in a predetermined situation. Therefore, the present invention is directed to a method and an apparatus for processing an uplink random access resource, Solve the above problem. According to an aspect of the present invention, a method for processing an uplink random access resource is provided. The method for processing an uplink random access resource according to the present invention is applied to a communication system including a core network, a base station, and a terminal, where the method includes: receiving, by the base station, a predetermined event notification message from the core network, and adding uplink randomization to all terminals Access resources, so that the terminal completes the uplink random access procedure. Preferably, the base station sends a predetermined event notification message to all the terminals, and adding the uplink random access resource specifically includes: after the base station sends the predetermined event notification message to all the terminals within a predetermined duration, the base station increases the uplink random access resource. Preferably, after the base station adds the uplink random access resource, the method further includes: in response to the predetermined event notification message received by the terminal, the terminal completes the uplink random connection to the base station by using the original uplink random access resource within a predetermined duration. In response to the predetermined event notification message received by the terminal, after waiting for the predetermined duration, the terminal completes the uplink access procedure to the base station by using the original uplink random access resource or the increased uplink access resource. Preferably, the base station sends the predetermined event notification message to all the terminals, and adding the uplink random access resource specifically includes: the base station increases the uplink random access resource, and sends the predetermined event notification message to the terminal within a predetermined duration. Preferably, after the base station sends the predetermined event notification message to all the terminals in the predetermined duration, the method further includes: in response to the predetermined event notification message received by the terminal, the terminal completes the uplink random access to the base station by using the increased uplink random access resource. The process or the terminal performs the uplink random access procedure to the base station by using the original uplink random access resource in response to the predetermined event notification message received by the terminal. Preferably, the increasing the uplink random access resource specifically includes: increasing a sequence of uplink random access of each cell and/or increasing physical resources of the uplink random access. Preferably, the base station notifies the terminal of the uplink random access resources added by the system broadcast; or the base station and the terminal pre-agreed the added uplink random access resources. Preferably, after the uplink random access resource is added, the method further includes: when the number of terminals in the connected state in the network decreases to a predetermined threshold, the base station deletes the added uplink random access resource. Preferably, the predetermined event notification message is used to notify the occurrence of the information of the predetermined event, wherein the predetermined event is an earthquake tsunami warning event. According to another aspect of the present invention, a base station is provided. The base station according to the present invention includes: a receiving module, configured to receive a predetermined event notification message from the core network; a sending module, configured to send a predetermined event notification message to all the terminals; and a processing module, configured to add an uplink random access resource. With the present invention, the method for increasing the uplink random access resources by the base station in response to the predetermined event notification message solves the problem that the user can not access the network for communication in a predetermined situation under the predetermined situation, and the network congestion is alleviated. . BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 1 is a structural block diagram of an ETWS according to the related art; FIG. 2 is a flowchart of a method for processing an uplink random access resource according to Embodiment 1 of the present invention; FIG. 3 is an uplink according to Embodiment 2 of the present invention; A flowchart of a method for processing a random access resource; FIG. 4 is a structural block diagram of a base station according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a method for processing an uplink random access resource, and further provides a base station, and the base station responds to a predetermined event (for example, an earthquake warning tsunami, etc.) notification message to the terminal. The scheduled event notification message is sent, and the uplink random access resource is added. Thereafter, the terminal receives the predetermined event notification message, and completes the uplink random access procedure to the base station. Below will refer to the attached drawings The invention will be described in detail in conjunction with the embodiments. The features of the embodiments of the present invention and the embodiments may be combined with each other if they do not conflict. Method Embodiments According to an embodiment of the present invention, a method for processing an uplink random access resource is provided. A method for processing an uplink random access resource according to the present invention is applied to a core network (Core

The network, which is abbreviated as CN, the communication system of the base station and the terminal, the method includes: the base station receives and sends a predetermined event notification message from the core network to the terminal, and adds the uplink random access resource, so that the terminal completes the uplink random access procedure. The operation of adding an uplink random access resource includes: increasing a sequence of uplink random access of each cell and/or increasing physical resources of uplink random access. Preferably, the base station and the terminal may pre-agreed the added uplink random access resources before the uplink random access resources are added. After the uplink random access resources are added, the base station does not notify the terminal of which resources are specifically added. Alternatively, the uplink random access resource to be added by the base station is some resources temporarily determined by the base station side, and the base station informs the terminal to know the newly added uplink random access resources in some manner; for example, the base station can notify all terminals by means of system broadcast. Increased uplink random access resources. Specifically, the process of the base station transmitting the predetermined event notification message to the terminal and increasing the uplink random access resource may be performed by using one of the following methods:

(1) The base station adds the uplink random access resource to the terminal after the predetermined event notification message is sent to all the terminals in the predetermined duration; wherein, the predetermined duration may refer to the time required by the base station specified by the protocol to notify all terminals of the message that the ETWS event occurs; example. In the Long-Term Evolution (LTE) system, it is currently stipulated that all terminals must be notified within 4s. Thereafter, the terminal side may perform an operation of: after responding to the received predetermined event notification message, the terminal completes the uplink random access procedure to the base station by using the original uplink random access resource within a predetermined time period; After the event notification message, after waiting for a predetermined period of time, the terminal completes the uplink random access procedure to the base station by using the original uplink random access resource or the added uplink random access resource.

(2) The base station increases the uplink random access resource, and then the base station sends a predetermined event notification message to all terminals within a predetermined time period. Thereafter, the terminal side may perform the following operations: in response to the received predetermined event notification message, the terminal completes the uplink random access procedure to the base station by using the added uplink random access resource; or completes the uplink random access resource to the base station by using the original uplink random access resource. Uplink random access procedure. During a period of time after a predetermined event (for example, an earthquake tsunami) occurs, the base station maintains an increased uplink random access resource, and when the number of terminals in the connected state in the network falls to a predetermined threshold, the base station returns to normal uplink random access. The number of resources, that is, the base station deletes the added uplink random access resources. In this embodiment, the method for adding the uplink random access resource by the base station in response to the predetermined event notification message provides more uplink random access resources for the terminal in the idle state, and solves the problem in the prior art in the predetermined situation. The problem that the user cannot access the network for communication in time, the probability of collision of the user is reduced, and the congestion of the network is alleviated. Below ^! The implementation process of the embodiment of the present invention is described in detail by taking the frequency division duplex (FDD) mode of the LTE system as an example.

H has no system bandwidth of 20M, and there are 838 uplink random access sequences. The sequence of uplink random access procedures allocated by each cell is 64, and the physical resources of the machine access are 6 physical resource blocks. PRB), and each PRB occupies the entire subframe in time. When the terminal initiates uplink random access, an uplink random access sequence occupies the physical resources of the entire six PRBs. Each terminal can select different uplink random access sequences in the allocated sequence, and send them to the base station on 6 PRBs, and the base station distinguishes the terminals by using an uplink random sequence. There were no earthquakes or tsunami events in H. Embodiment 1 FIG. 2 is a flowchart of a method for processing an uplink random access resource according to Embodiment 1 of the present invention. As shown in FIG. 2, the method includes Step S202 and Step S204: Step S202, the core network sends to the base station. The predetermined event notification message notifies the base station that a predetermined event has occurred, and the base station transmits the predetermined event notification message to the terminal within a predetermined duration (for example, 4s) by transmitting a predetermined event notification message to the terminal, and then the base station increases the uplink random access resource, and needs to It is noted that the base station still retains the existing uplink random access resources. For example, in LTE FDD mode, there are 1200 subcarriers, and one PRB occupies 12 subcarriers in the frequency direction. Therefore, there are 100 PRBs in the frequency direction, which can be divided into the following three types. Add uplink random access resources:

(1) Increase the uplink random access resources to (6x10) PRBs, and the system's uplink random access capability is increased by 10 times.

(2) By increasing the sequence of uplink random access for each cell, for example, the number of uplink random access sequences per cell can be increased to 128 after a predetermined event occurs.

(3) Simultaneously increase the uplink random access sequence and the uplink random access resources of each cell. The above three methods can alleviate the collision phenomenon in the severe uplink random access process caused by the excessive number of users that initiate the uplink random access at the same time, and improve the reliability of the uplink random access. Among them, the degree of increase of physical resources can be obtained through simulation. Considering the size of the physical resources used by the system to send data services and the proportional relationship of the number of random access physical resources, the specific values can be derived from simulations or based on the operating experience of the system. The basis for determining the increase of the physical resource size is that the optimal value is obtained by simulation between the physical resource utilization efficiency of the transmitted data and the increased access probability of the physical access physical resource, and the access requirement of the system can be satisfied. The increase of the sequence is related to the total number of sequences that the system can provide. After the access sequence of each cell is increased, as long as the same sequence can be achieved between adjacent cells by optimizing the configuration, the sequence that can be added to one cell can be added. The number is larger, and the more sequences are added, the greater the probability of access. The increased number of sequences is also obtained by simulation. The basis for determining the number of sequences to be added is: The random access in the cell satisfies the system requirements and does not affect the random access of the neighboring cells. Step S204: After receiving the predetermined event notified by the base station, the terminal may complete the uplink random access procedure to the base station by using the original uplink random access resource within a predetermined duration (for example, 4s); after the predetermined duration, the terminal The uplink random access procedure may be completed to the base station by using the original uplink random access resource or the added uplink random access resource. Embodiment 2 FIG. 3 is a flowchart of a method for processing an uplink random access resource according to Embodiment 2 of the present invention. As shown in FIG. 3, the method includes: Step S302: The core network sends a predetermined event notification message to the base station to notify the base station that a predetermined event has occurred, and the base station adds the uplink random access resource. It should be noted that the base station still retains the existing uplink random connection. Entering the resource, then, the base station sends a predetermined event notification to all terminals within a predetermined length of time. The notification informs the terminal that a predetermined event has occurred. For example, in the LTE FDD mode, there are 1200 subcarriers, and one PRB occupies 12 subcarriers in the frequency direction. Therefore, there are 100 PRBs that can be divided in the frequency direction. The uplink random access resources can be added in the following three ways: (1) The uplink random access resources are increased to (6 X 10 ) PRBs, and the system's uplink random access capability is increased by 10 times.

(3) Simultaneously increase the uplink random access sequence and the uplink random access resources of each cell. The above three methods can alleviate the collision phenomenon in the severe uplink random access process caused by the excessive number of users that initiate the uplink random access at the same time, and improve the reliability of the uplink random access. Among them, the degree of increase of physical resources can be obtained through simulation. Considering the size of the physical resources used by the system to send data services and the proportional relationship of the number of random access physical resources, the specific values can be derived from simulations or based on the operating experience of the system. The basis for determining the increase of the physical resource size is that the optimal value is obtained by simulation between the physical resource utilization efficiency of the transmitted data and the increased access probability of the physical access physical resource, and the access requirement of the system can be satisfied. The increase of the sequence is related to the total number of sequences that the system can provide. After the access sequence of each cell is increased, as long as the same sequence can be achieved between adjacent cells by optimizing the configuration, the one can be added to one cell. The number of sequences is relatively large. The more sequences that are added, the greater the probability of access. The increased number of sequences is also obtained by simulation. The basis for determining the number of sequences to be added is that the random access in the cell satisfies the system requirements and does not affect the random access of the neighboring cells. After receiving the ETWS event notified by the base station, the receiving end may initiate uplink random access on the newly added uplink random access resource. Step S304: After receiving the predetermined event notified by the base station, the terminal may complete the uplink random access procedure to the base station by using the original uplink random access resource or the added uplink random access resource. Device embodiment According to an embodiment of the present invention, there is provided a base station preferably applied to a communication system including a core network, a base station, and a terminal. FIG. 4 is a structural block diagram of a base station according to an embodiment of the present invention. As shown in FIG. 4, the base station includes: a receiving module 42, a sending module 44, and a processing module 46. The foregoing structure is described in detail below. The receiving module 42 is configured to receive a predetermined event notification message from the core network. The sending module 44 is connected to the receiving module 42 and configured to send, to all terminals, a predetermined event notification message to the terminal that is received by the receiving module 42. The processing module 46 is connected to the receiving module 42 for adding an uplink random access resource, and the operation specifically includes: increasing a sequence of uplink random access of each cell and/or increasing physical resources of uplink random access. The sending module 44 sends a predetermined event notification message to the terminal, and the processing module 46 increases the uplink random access resource by using one of the following methods:

(1) After the sending module 44 sends the predetermined event notification message to all the terminals within the predetermined duration, the processing module 46 adds the uplink random access resource; wherein, the predetermined duration refers to the information required by the protocol to notify the telnet event of the base station to notify all the terminals. Time; for example, all terminals must be notified within 4s in LTE.

(2) The processing module 46 increases the uplink random access resource, and then the sending module 44 sends a predetermined event notification message to all terminals within a predetermined duration. With the foregoing embodiment of the present invention, the method for the base station to increase the uplink access resource in response to the predetermined event notification message solves the problem that the user cannot access the network for communication in a predetermined situation in the prior art, and alleviates the problem. The congestion of the network. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. For those skilled in the art, the present invention can be variously modified and modified. Any modifications, equivalent substitutions, improvements, etc. made therein are intended to be included within the scope of the present invention.

Claims

Claim

A method for processing an uplink random access resource, which is applied to a communication system including a core network, a base station, and a terminal, where the method includes:

The base station receives and sends a predetermined event notification message from the core network to all the terminals, and adds an uplink random access resource, so that the terminal completes the uplink random access procedure.

The method according to claim 1, wherein the sending, by the base station, the predetermined event notification message to all the terminals, and adding the uplink random access resource specifically includes:

After the base station sends the predetermined event notification message to all the terminals within a predetermined duration, the base station adds the uplink random access resource, so that the terminal completes an uplink random access procedure.

The method according to claim 2, wherein after the base station adds an uplink random access resource, the method further includes:

In response to the predetermined event notification message received by the terminal, the terminal initiates an uplink random access procedure to the base station by using the original uplink random access resource within the predetermined duration;

Responding to the predetermined event notification message received by the terminal, after the terminal waits for the predetermined duration, using the original uplink random access resource or the added uplink access resource to the base station The uplink random access procedure is completed.

The base station adds the uplink random access resource, and sends the predetermined event notification message to all the terminals within a predetermined duration.

The method according to claim 4, after the base station sends the predetermined event notification message to all the terminals within a predetermined duration, the method further includes: responding to the terminal receiving The predetermined event notification message, the terminal completing an uplink random access procedure to the base station by using the added uplink random access resource; or In response to the predetermined event notification message received by the terminal, the terminal completes an uplink random access procedure to the base station by using an original uplink random access resource.

The method according to any one of claims 1 to 5, wherein the adding the uplink access resource specifically includes:

Increasing the sequence of uplink random access of each cell and/or increasing the physical resources of uplink random access.

The method according to any one of claims 1 to 5, characterized in that:

Transmitting, by the system broadcast, the uplink random access resource added by the terminal by using a system broadcast; or

The base station and the terminal pre-agreed the added uplink random access resources.

The method according to claim 1, wherein after adding the uplink random access resource, the method further includes:

When the number of terminals in the connected state in the network drops to a predetermined threshold, the base station deletes the added uplink random access resources.

9. The method according to any one of claims 1 to 5, wherein:

The predetermined event notification message is used to notify information that a predetermined event occurs, wherein the predetermined event is an earthquake tsunami warning event.

A base station, comprising:

a receiving module, configured to receive a predetermined event notification message from the core network, a sending module, configured to send the predetermined event notification message to all the terminals, and a processing module, configured to add an uplink random access resource.