CN107534998A - MTC device cut-in method, base station and system - Google Patents

MTC device cut-in method, base station and system Download PDF

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Publication number
CN107534998A
CN107534998A CN201580079030.9A CN201580079030A CN107534998A CN 107534998 A CN107534998 A CN 107534998A CN 201580079030 A CN201580079030 A CN 201580079030A CN 107534998 A CN107534998 A CN 107534998A
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random access
group
mtc
base station
group leader
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高峰
秦新涛
徐少毅
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the present invention provides a kind of MTC device cut-in method, base station and system, including：MTC device is grouped and selects group leader by base station, the first random access lead code is selected to carry out Network with Random Multiple Access System from available random access lead code so that group leader represents whole MTC device group, the probability of the first random access lead code of multiple MTC device simultaneous selection identicals is effectively reduced, effectively increases the probability that MTC device is successfully accessed.

Description

MTC (machine type communication) equipment access method, base station and system Technical Field
The present invention relates to communications technologies, and in particular, to an MTC device access method, a base station, and a system.
Background
With the rapid development of Machine-to-Machine (M2M) services, the convergence of M2M and a Long Term Evolution-Advanced (LTE-a) network is an inevitable trend of future communication development, and since the LTE-a system has only 64 Random Access preambles, simultaneous Access of multiple Machine Type Communication (MTC) devices in M2M increases the load of a wireless network, and when two or more MTC devices select the same Random Access Preamble, and Access is performed on the same Random Access Channel (RACH) time-frequency resource, Access collision may be caused, resulting in Access failure. Therefore, the existing M2M random access procedure must be optimized to deploy multiple MTC devices in an LTE-a system, so as to propose an effective access mechanism to deal with the problem caused by the random access service of multiple MTC devices.
In the prior art, a random access control backoff mechanism is proposed, when an MTC device is ready for random access, a random number is randomly generated in a range from 0 to 1, the random number is compared with a limiting Factor (ac-Barring Factor) in a system message (SIB2), when the random number is smaller than the limiting Factor, the MTC device initiates a random access request, otherwise, the MTC device performs random access after randomly backoff for a period of time.
The access mechanism can reduce the probability of random access collision to a certain extent, but when a large number of MTC devices are deployed in a cell, random access collision can be caused by the simultaneous access initiation of the large number of MTC devices, so that access failure is caused.
Disclosure of Invention
The embodiment of the invention provides a random access method, a base station and a system of MTC (machine type communication) equipment, which are used for overcoming the problem of access failure caused by simultaneous access initiation of a large number of MTC equipment in the prior art.
The first aspect of the present invention provides a random access method for MTC devices, including:
the base station divides at least two MTC (machine type communication) devices into at least two MTC device groups;
the base station selects group length equipment corresponding to each MTC equipment group;
the base station receives a random access request message sent by the group leader equipment on behalf of other MTC equipment in a group where the group leader is located, wherein the random access request message comprises a first random access lead code, and the random access request message is a message sent by the group leader on behalf of the group leader MTC equipment;
and the base station sends a first random access response message to the group leader equipment so as to enable the group leader equipment and other MTC equipment in an MTC equipment group where the group leader equipment is located to perform random access to a network according to the first random access response message.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the dividing, by the base station, at least two MTC devices into at least two MTC device groups includes:
the base station acquires service characteristic information of the at least two MTC devices, wherein the service characteristic information comprises at least one of the following characteristic information: power level, path delay.
The base station divides the at least two MTC devices into at least two MTC device groups according to the service characteristic information of the at least two MTC devices.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the service characteristic further includes: an initial timing correction value for each MTC device,
the base station selects group length equipment corresponding to each MTC equipment group, and the group length equipment comprises:
and the base station determines the group length equipment according to the initial timing correction value corresponding to each MTC equipment in the MTC equipment group.
With reference to the first aspect and any one possible implementation manner of the first to the second possible implementation manners of the first aspect, in a third possible implementation manner of the first aspect, before the receiving, by the base station, a random access request message sent by the group leader device, the method further includes:
the base station sends a random access priority threshold value to the group leader equipment so that the group leader equipment determines whether random access can be initiated according to the random access priority threshold value.
With reference to the first aspect and any one possible implementation manner of the first to third possible implementation manners of the first aspect, in a fourth possible implementation manner of the first aspect, before the receiving, by the base station, a random access request message sent by the group leader device, the method further includes: the base station determines a first random access lead code used for random contention access of MTC (machine type communication) equipment in a second random access lead code, so that the group leader equipment selects the lead code used for random access from the first random access lead code, and the second random access lead code is the lead code used for random contention access in a Long Term Evolution (LTE) system.
With reference to the first aspect and any one of the first to fourth possible implementation manners of the first aspect, in a fifth possible implementation manner of the first aspect, the sending, by the base station, a first random access response message to the group leader device, so that the group leader device performs random access to the network according to the first random access response message includes:
the base station sends a first random access response message to the group leader equipment, wherein the first random access response message comprises: a first timing correction value, a first uplink time-frequency resource indication and a first temporary cell radio network identifier number, where the first uplink time-frequency resource indication is used to notify the group leader device of a first uplink time-frequency resource required for sending a first contention resolution message, so that the group leader device sends the first contention resolution message to the base station on the first uplink time-frequency resource according to the first timing correction value, where the first contention resolution message carries the first temporary cell radio network identifier number, and the first contention resolution message is used for the group leader device to request a random access network;
the base station receives the first competition resolution message, wherein the first competition resolution message carries the wireless network identification number of the first temporary cell;
and the base station sends a first competition result message to the group leader equipment according to the first temporary cell wireless network identification number, wherein the first competition result message is used for informing the group leader equipment whether to randomly access the network.
With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the base station allocates a group identifier ID to each group of MTC devices, and the first contention resolution message carries a group ID of an MTC device group in which the group length device is located;
the base station sends a first random access response message to the group leader device so that other MTC devices in the group of the group leader perform random access to the network according to the first random access response message, and the method comprises the following steps:
after the base station receives the first contention resolution message, the base station sends a second random access response message to each of the other MTC devices in the MTC device group in which the group leader device is located according to the group ID, so that the other MTC devices in the group in which the group leader device is located perform random access to the network according to the first random access response message.
With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the sending, by the base station, a second random access response message to each other MTC device in the MTC device group where the group leader device is located according to the group ID, so that the other MTC devices in the MTC device group where the group leader device is located perform random access to the network according to the first random access response message includes:
the base station respectively sends second random access response messages to other MTC devices in the MTC device group where the group leader device is located according to the group ID, wherein the second random access response messages comprise: a second timing correction value, a second uplink time-frequency resource indication and a first temporary cell wireless network mark number, so that the MTC device determines a second temporary cell wireless network mark number corresponding to the MTC device according to the first temporary cell wireless network mark number, the second uplink time-frequency resource indication is used to notify the MTC device of a second uplink time-frequency resource required for sending a second contention resolution message, so that the MTC device sends the second contention resolution message to the base station on the second uplink time-frequency resource according to the second timing correction value, the second contention resolution message carries the second temporary cell wireless network mark number, and the second contention resolution message is used for the MTC device to request a random access network;
the base station receives the second competition resolution message, wherein the second competition resolution message carries the wireless network identification number of the second temporary cell;
and the base station sends a second competition result message to the MTC equipment according to the second temporary cell wireless network identification number, wherein the second competition result message is used for informing the MTC equipment whether the MTC equipment can randomly access the network.
With reference to the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, the base station allocates an index number to each MTC device in the MTC device group, so that the MTC device determines the second temporary cell radio network identifier number according to the first temporary cell radio network identifier number and the MTC device index number.
With reference to the first aspect and any one of the first to eighth possible implementation manners of the first aspect, in a ninth possible implementation manner of the first aspect, before the sending, by the base station, a random access response message to the group leader device, the method further includes:
the base station determines the number of MTC devices in a group where the group leader device is located;
and the base station allocates the first uplink time-frequency resource and the second uplink time-frequency resource for the MTC equipment in the group according to the number of the MTC equipment.
A second aspect of the present invention provides a base station, including:
the grouping module is used for grouping the at least two MTC (machine type communication) devices into at least two groups of MTC device groups;
the group length selection module is used for selecting group length equipment corresponding to each MTC equipment group;
a receiving module, configured to receive a random access request message sent by a group leader device on behalf of other MTC devices in a group to which the group leader device belongs, where the random access request message includes a first random access preamble, and the random access request message is a message sent by the group leader on behalf of the group to which the group leader device belongs;
a first sending module, configured to send a first random access response message to the group leader device, so that the group leader device and other MTC devices in the MTC device group where the group leader device is located perform random access to a network according to the first random access response message.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the grouping module is specifically configured to:
acquiring service characteristic information of the at least two MTC devices, wherein the service characteristic information comprises at least one of the following characteristic information: power level, path delay.
And dividing the at least two MTC devices into at least two MTC device groups according to the service characteristic information of the at least two MTC devices.
With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the service characteristic further includes: an initial timing correction value for each MTC device,
the grouping module is further configured to:
and determining the group leader equipment according to the initial timing correction value corresponding to each MTC equipment in the MTC equipment group.
With reference to the second aspect and any one possible implementation manner of the first to second possible implementation manners of the second aspect, in a third possible implementation manner of the second aspect, the method further includes:
a second sending module, configured to send a random access priority threshold to the group leader device before the receiving module receives the random access request message sent by the group leader device, so that the group leader device determines whether random access can be initiated according to the random access priority threshold.
With reference to the second aspect and any one possible implementation manner of the first to third possible implementation manners of the second aspect, in a fourth possible implementation manner of the second aspect, the method further includes:
a determining module, configured to determine, before the receiving module receives the random access request message sent by the group leader device, a first random access preamble for random contention access by the MTC device in a second random access preamble, so that the group leader device selects a preamble for random access from the first random access preamble, where the second random access preamble is a preamble for random contention access in a long term evolution LTE system.
With reference to the second aspect and any one possible implementation manner of the first to fourth possible implementation manners of the second aspect, in a fifth possible implementation manner of the second aspect, the first sending module is specifically configured to:
sending a first random access response message to the group leader device, where the first random access response message includes: a first timing correction value, a first uplink time-frequency resource indication and a first temporary cell radio network identifier number, where the first uplink time-frequency resource indication is used to notify the group leader device of a first uplink time-frequency resource required for sending a first contention resolution message, so that the group leader device sends the first contention resolution message to the base station on the first uplink time-frequency resource according to the first timing correction value, where the first contention resolution message carries the first temporary cell radio network identifier number, and the first contention resolution message is used for the group leader device to request a random access network;
receiving the first competition resolution message, wherein the first competition resolution message carries the wireless network identification number of the first temporary cell;
and sending a first competition result message to the group leader device according to the first temporary cell radio network identification number, wherein the first competition result message is used for informing the group leader device whether the group leader device can randomly access the network.
With reference to the fifth possible implementation manner of the second aspect, in a sixth possible implementation manner of the second aspect, the method further includes: a distribution module, configured to distribute a group identifier ID for each group of MTC devices, where the first contention resolution message carries a group ID of an MTC device group in which the group leader device is located;
the first sending module is further configured to:
after receiving the first contention resolution message, the base station sends a second random access response message to each of the other MTC devices in the group of MTC devices in which the group leader device is located according to the group ID, so that the other MTC devices in the group in which the group leader device is located perform random access to the network according to the first random access response message.
With reference to the sixth possible implementation manner of the second aspect, in a seventh possible implementation manner of the second aspect, the first sending module is specifically configured to:
respectively sending second random access response messages to other MTC devices in an MTC device group where the group leader device is located according to the group ID, wherein the second random access response messages comprise: a second timing correction value, a second uplink time-frequency resource indication and a first temporary cell wireless network mark number, so that the MTC device determines a second temporary cell wireless network mark number corresponding to the MTC device according to the first temporary cell wireless network mark number, the second uplink time-frequency resource indication is used to notify the MTC device of a second uplink time-frequency resource required for sending a second contention resolution message, so that the MTC device sends the second contention resolution message to the base station on the second uplink time-frequency resource according to the second timing correction value, the second contention resolution message carries the second temporary cell wireless network mark number, and the second contention resolution message is used for the MTC device to request a random access network;
the receiving module is further configured to:
receiving the second competition resolution message, wherein the second competition resolution message carries the wireless network identification number of the second temporary cell;
the first sending module sends a second competition result message to the MTC device according to the second temporary cell wireless network identification number, wherein the second competition result message is used for informing the MTC device whether the MTC device can randomly access the network.
With reference to the seventh possible implementation manner of the second aspect, in an eighth possible implementation manner of the second aspect, the allocating module is further configured to: allocating an index number to each MTC device in the MTC device group, so that the MTC device determines the second temporary cell wireless network identification number according to the first temporary cell wireless network identification number and the MTC device index number.
With reference to the second aspect and any one possible implementation manner of the first to eighth possible implementation manners of the second aspect, in a ninth possible implementation manner of the second aspect, the determining module is further configured to determine, before the first sending module sends the random access response message to the group leader device, the number of MTC devices in a group in which the group leader device is located;
the allocation module is further configured to allocate the first uplink time-frequency resource and the second uplink time-frequency resource to the group of MTC devices according to the number of the MTC devices.
A third aspect of the present invention provides an MTC device access system, including a plurality of MTC devices and the base station as described in any one of the second aspect and the first to ninth possible implementations of the second aspect.
In the invention, a base station divides at least two MTC devices into at least two groups of MTC device groups, then the base station selects group length devices corresponding to each group of MTC device groups, and then the base station receives a random access request message sent by the group length devices representing other MTC devices in the group where the group length is located, wherein the random access request message comprises a first random access lead code, the random access request message is a message sent by the group length representing the MTC device group where the group length is located, and finally, the base station sends a first random access response message to the group length devices, so that the group length devices and the other MTC devices in the MTC device group where the group length devices are located carry out random access to a network according to the first random access response message. The base station groups the MTC equipment and selects the group length, so that the group length represents the whole MTC equipment group to select the first random access lead code from the available random access lead codes to carry out random access to the network, the probability that a plurality of MTC equipment simultaneously select the same first random access lead code is effectively reduced, and the probability of successful access of the MTC equipment is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 illustrates a contention-based random access procedure in an LTE-a system;
fig. 2 is a flowchart illustrating an MTC device access method according to an embodiment of the present invention;
fig. 3 is a model diagram illustrating clustering of MTC devices in a cell;
fig. 4 is a model diagram illustrating grouping of MTC devices within a cell;
fig. 5 shows a preamble allocation diagram;
fig. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a base station according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram of a base station according to still another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The random access procedure in the LTE-a system may be divided into a contention-based random access procedure and a non-contention-based random access procedure. The essential difference between them is whether the terminal to be accessed receives a dedicated random access resource, such as a random access preamble, from the network allocation before initiating random access. In the non-competition-based random access process, a network configures special random access resources for a terminal to be accessed, so that collision and collision caused by the fact that the terminal selects the same resources with other terminals are avoided; however, in the contention-based random access process, since the terminal randomly selects the access resource to initiate access according to the random access parameter broadcasted in the cell system message, different terminals may select the same random access resource, which may cause collision and result in failure of the random access.
However, since the LTE-a system only has 64 random access preambles, random access of a large number of terminals can only adopt a contention-based random access process, referring to 3GPP TS 36.3215.1, fig. 1 shows the contention-based random access process in the LTE-a system, which is divided into 4 steps, as shown in fig. 1, the contention-based random access process in the LTE-a system is divided into 4 steps, specifically:
step 101: the terminal sends a random access request message to the base station.
The terminal selects one random access preamble from 64 random access preambles specified in the LTE-a system and transmits the random access preamble to the base station through a random access request message Msg 1.
Step 102: the base station transmits a random access response message to the terminal.
After receiving a random access request message Msg1 sent by a terminal, a base station sends a random access response message Msg2 to the terminal, where the random access response message Msg2 includes a sequence number of a received random access preamble, a Timing Advance (TA for short) calculated from the received random access preamble, an uplink time-frequency resource indicator (used for uplink transmission of the contention resolution message Msg 3), and a Temporary Cell Radio Network Identifier (TC-RNTI for short).
Step 103: the terminal sends a contention resolution message Msg3 to the base station.
After the terminal receives the random access response message Msg2 sent by the base station and matched with the random access preamble in the previous random access request message Msg1, the terminal sends a contention resolution message Msg3 including the TC-RNTI in the random access response message Msg2 to the base station.
Step 104: the base station sends a contention result message Msg4 to the terminal.
When the base station receives a competition resolution message Msg3 sent by the terminal, a competition result message Msg4 containing TC-RNTI is sent to the terminal, when the terminal receives a competition result message Msg4 containing TC-RNTI, whether the TC-RNTI contained in the competition result message Msg4 is matched with the TC-RNTI in the competition resolution message Msg3 sent to the base station before is detected, and if the TC-RNTI is matched with the TC-RNTI, the access success of the terminal is indicated.
However, when the terminal performs random access by using the above method, because the number of the selectable random access preamble codes is limited, the probability that the terminal simultaneously selects the same random access preamble code for access is very high, and thus the probability of terminal access failure is increased.
The invention groups a plurality of terminal devices, and sends the random access request message containing the random access lead code to the base station only through the group length standby list of each group, because the terminals competing for the random access lead code are only group length, the probability of selecting the same random access lead code is reduced, thereby effectively improving the probability of successful access of the terminals.
It should be noted that the terminal in the present invention is an MTC device.
Fig. 2 is a flowchart illustrating an MTC device access method according to an embodiment of the present invention, and as shown in fig. 2, the method according to the embodiment may include:
step 201, the base station divides at least two MTC devices into at least two groups of MTC device groups.
Specifically, when the MTC devices in the cell initially access the network, the access method shown in fig. 1 may be used for accessing, and after the MTC devices are successfully accessed, the service characteristic information corresponding to the MTC devices may be reported to the base station, so that the base station may group all the MTC devices according to the service characteristic information corresponding to the MTC devices, and at least two MTC device groups are obtained. The service characteristic information may include, but is not limited to, the following information: power level, path delay.
Step 202: and the base station selects the group length equipment corresponding to each group of MTC equipment.
After the base station groups the MTC devices in the cell, a group leader device may be selected from each MTC device group, so that the group leader device represents other MTC devices in the MTC device group in which the group leader device is located to select a random access preamble from random access preambles provided by the LTE system, where the random access preamble is used for all MTC devices in the group to access the network.
The specific process of selecting the group leader may be: in step 201, the service characteristics of the MTC devices in the cell acquired by the base station further include: and the base station determines the group length equipment in the MTC equipment group according to the TA corresponding to each MTC equipment.
Further, the group leader device may be selected according to the following criteria:
wherein, i represents the ith MTC device in the group and is the average TA value corresponding to the MTC device group, M is the number of the MTC devices in the MTC device group, and TA isiAnd i is more than or equal to 1 and less than or equal to M, which is TA of the ith MTC device in the MTC device group.
And when the TA of a plurality of MTC devices is close to the average TA value of the group, the base station randomly selects one of the MTC devices as the group length device.
Step 203: the base station receives a random access request message sent by group leader equipment, wherein the random access request message comprises a first random access lead code, and the random access request message is a message sent by an MTC equipment group in which the group leader represents the group leader.
When data needs to be sent by a certain MTC device group, the group leader device is switched from an idle state to a monitoring state, other MTC devices in the MTC device group where the group leader device is located select a first random access lead code from the random access lead codes in the LTE system to perform random access, and send a random access request message carrying the selected first random access lead code to the base station.
Step 204: and the base station sends the first random access response message to the group leader equipment so as to enable the group leader equipment and other MTC equipment in the MTC equipment group where the group leader equipment is located to perform random access to the network according to the first random access response message.
Specifically, after receiving a random access request message (Msg 1 in the following embodiment) sent by the group leader device, the base station calculates a first timing correction value, a first uplink time-frequency resource, and a first temporary cell radio network identifier number TC-RNTI corresponding to the group leader device0And sends TA carrying the first timing correction value to the group leader equipment0First uplink time-frequency resource indication and TC-RNTI0Is received (hereinafter, referred to as Msg2 in the embodiment)0) The first uplink time-frequency resource indication is used for notifying the group leader of the first uplink time-frequency resource required for sending the first contention resolution message.
When the group leader equipment receives the Msg2 sent by the base station0Then according to Msg20Sends a first contention resolution message (Msg 3 in the following embodiment) to the allocated first uplink time-frequency resource0) I.e. according to TA on the first uplink time-frequency resource0Sending a bearer TC-RNTI0Msg3 (g)0。
When the base station receives the Msg3 sent by the group leader device0Then, that is, if the collision is not sent, the base station sends a message carrying TC-RNTI to the group leader equipment0Is sent (hereinafter, referred to as Msg4 in the embodiment)0)。
When the group leader device receives the Msg40Then, if Msg40TC-RNTI carried in0Msg3 sent to base station by group leader0TC-RNTI in (1)0If the two signals are the same, the group leader equipment is indicated to be successfully accessed.
Further, when the base station groups the MTC devices in the cell, each MTC device may be groupedGroup assignment Identification (Identification, abbreviated as ID), which is used to identify MTC device group, Msg3 sent to base station at group leader device0The group ID of the MTC device group where the group leader device is located is also carried, so that when the base station receives the Msg30Then, a second random access response message (hereinafter, referred to as Msg2 in the embodiment) is sent to other MTC devices in the MTC device group of the group leader device according to the group ID1) So that other MTC devices can receive the Msg2 according to the received Msg1A random access network is requested.
Specifically, the base station sends a second random access response message Msg2 to each other MTC device in the MTC device group in which the group leader device is located according to the group ID and the group ID1Wherein Msg21Carries a second timing correction value TA corresponding to each other MTC device1Second uplink time-frequency resource indication and TC-RNTI corresponding to group length equipment0And the second uplink time-frequency resource indication is used for informing the MTC device of the second uplink time-frequency resource required by the transmission of the second contention resolution message.
When the MTC device in the MTC device group where the group leader device is located receives the Msg21Then, firstly, according to TC-RNTI therein0Determining a second temporary cell radio network identifier TC-RNTI corresponding to the MTC equipment1. Then according to Msg20Sends a second contention resolution message (Msg 3 in the following embodiment) to the second uplink time-frequency resource allocated in the first uplink time-frequency resource allocation1) I.e. according to TA on the second uplink time-frequency resource1Sending a bearer TC-RNTI1Msg3 (g)1。
When the base station receives the Msg3 sent by the MTC device in the MTC device group where the group leader device is located1Then, that is, the base station indicates that no collision is sent, the base station sends the carrier TC-RNTI to the MTC equipment1Is sent (hereinafter, referred to as Msg4 in the embodiment)1)。
When the MTC device receives the Msg41Then, if Msg41TC-RNTI1 carried in the MTC equipment and Msg3 sent by the MTC equipment to a base station1The TC-RNTI1 in the MTC device is the same, which indicates that the MTC device is successfully accessed.
Further, the MTC equipment is based on TC-RNTI0Determining TC-RNTI corresponding to MTC equipment1The method specifically comprises the following steps:
the base station allocates index numbers for each MTC device in the MTC device group, and TC-RNTI corresponding to the MTC device1Is TC-RNTI0And the sum of the index number of the MTC device, namely:
TC-RNTI1＝TC-RNTI0+ index number of this MTC device.
In this embodiment, the base station divides at least two MTC devices into at least two MTC device groups, then selects a group leader device corresponding to each MTC device group, and then receives a random access request message sent by the group leader device on behalf of other MTC devices in the group where the group leader is located, where the random access request message includes a first random access preamble, and the random access request message is a message sent by the group leader on behalf of the MTC device group where the group leader is located, and finally, the base station sends a first random access response message to the group leader device, so that the group leader device and other MTC devices in the MTC device group where the group leader device is located perform random access to the network according to the first random access response message. The base station groups the MTC equipment and selects the group length, so that the group length represents the whole MTC equipment group to select the first random access lead code from the available random access lead codes to carry out random access to the network, the probability that a plurality of MTC equipment simultaneously select the same first random access lead code is effectively reduced, and the probability of successful access of the MTC equipment is effectively improved.
Optionally, to avoid the influence of the random access performed by the MTC device on the random access of the H2H terminal, before step 203, the method may further include: the random access resource used by the MTC equipment is separated from the random access resource used by the H2H terminal, and X random contention accesses for the H2H terminal and the MTC equipment are allocated to N preambles used for random contention accesses in 64 access preambles of the LTE system. Therefore, the situation that the H2H terminal cannot be normally accessed due to the access of a large number of MTC devices in a period of time can be avoided, and the access quality of the H2H terminal is ensured. Fig. 5 shows a preamble allocation diagram.
Optionally, in step 201, when the base station groups the MTC devices, a maximum value of the number of the MTC devices in each group may be set, and when the MTC devices in a group are greater than the maximum value, the MTC device group may be re-established according to the remaining MTC devices, and when the number of members in the MTC device group is limited, the collision probability when the members in the group send the contention resolution message Msg3 at the same time may be reduced.
In step 201, in the process that the base station groups the MTC devices in the cell according to the service characteristics, the MTC devices that can always keep the same state (access, attach, release) may be first divided into a cluster, and the MTC member devices in each cluster necessarily have the same QoS requirement, where fig. 3 is a model diagram of clustering the MTC devices in the cell, and then according to the power level and the path delay in the service characteristics, i.e. the MTC devices with similar positions are further divided into MTC device groups, and fig. 4 is a model diagram of grouping the MTC devices in the cell.
Furthermore, because the time delay budgets corresponding to each MTC device group are different, in order to effectively reduce collisions caused by a large number of MTC devices accessing the network at the same time, different access classes may be set for the MTC device groups with different time delay budgets, and a high-priority MTC device group with a smaller time delay tolerance delay may access the network with a smaller time delay, thereby ensuring QoS requirements of different M2M service characteristics.
Assuming that N MTC devices are shared in a cell, the N MTC devices are divided into K MTC device groups, and each MTC device group has Mk(K is 1,2, …, K) MTC devices, then
N＝M1+M2+…+Mk
The group length of each access group is recorded as GDK, and the tolerant access time delay budget or threshold of the MTC device in each MTC device group is set as T according to the Quality of Service (QoS) requirement of each MTC device groupbAnd the waiting access time of random access of the group leader equipment is recorded as TwI.e. group length residual tolerant delay time of Tb-TwThe base station sets an access priority threshold according to the grouping number of the MTC and the load characteristic of the network, and the access priority threshold is marked as p; the random access priority p of each MTC device group is noted as:
wherein p is the random of MTC equipment groupThe access priority, mu is a weight factor, which represents the influence proportion of two part factors, TwWaited access time, T, for random access of group leader devicebAn access time delay tolerance budget or threshold for the MTC devices in each MTC device group.
The range of the access priority is (0, 1), the access priority is composed of two parts, (1-mu) rand (1) is a random number which generates 0 to 1 and indicates that the MTC equipment group initiates random access with a certain probability p; is delay tolerant delay, when the access latency is higher in proportion to the tolerant delay budget, the access priority is higher. The access collision probability can be reduced by priority access control.
Before the random access request message sent by the group leader device to the base station, the base station may set different access priority thresholds according to the resource usage of the current network, and send a random access priority threshold value P to the group leader devicehSo that the group leader equipment can access the threshold value P according to the random access priorityhWhether random access can be initiated is determined, so that the influence of the MTC equipment on the H2H equipment access can be effectively controlled.
When the group leader equipment receives the random access priority threshold value P sent by the base stationhAnd then, judging whether the random access priority p corresponding to the base station per se meets a preset relational expression, if so, randomly selecting one random access lead code from the optional random access lead codes, and sending a random access request message Msg1 to the base station. Otherwise, wait time tbackThereafter, the random access request message Msg1 is retransmitted.
Wherein, the preset relational expression is as follows:
P≥Ph
after the group leader equipment fails to access, a backspacing access mechanism is adopted to avoid access collision of MTC equipment among all MTC equipment groups, and access can be restarted after the backspacing time is scheduled, wherein the backspacing time is recorded as:
tback＝α(Tb-Tw)
wherein, tbackFor a back-off time, TwIs provided for group leaderWaited access time, T, for standby random accessbAn access time delay tolerance budget or threshold for the MTC devices in each MTC device group.
Optionally, the base station may broadcast the random access priority threshold value P of the current system to the group leader devices of all MTC device groups in the system message SIB2h. The base station can set different access priority thresholds according to the resource use condition of the current network, so that the influence of the MTC equipment on the access of the H2H equipment can be effectively controlled.
Optionally, if the group leader device does not receive the first random access response message within the preset time, waiting for time tbackAnd then re-initiates the random access request message Msg 1. When the number of times of re-initiating the access request by the group leader equipment exceeds the system specified number, the access of the group MTC equipment fails.
Optionally, when the base station groups the MTC devices in the cell, the number of the MTC devices in each group of MTC devices may be known, and the base station may determine, according to the number of the MTC devices in each group of MTC devices, that the group leader device sends Msg30Required first uplink time-frequency resource and other MTC (machine type communication) equipment for sending Msg31And the required second uplink time-frequency resource. That is, the base station may allocate corresponding resources according to the number of the MTC devices in the MTC device group, thereby avoiding resource waste.
Optionally, when there are few resources available in the network, that is, the base station is allocated to each other MTC device in the MTC device group where the group leader device is located for sending Msg31The required second uplink time-frequency resource is not enough to enable all MTC devices to send Msg31And in order to improve the probability of successful access of the MTC devices in the MTC device group, when a base station finds that part of the MTC devices in the MTC device group in which the group leader device is located are not successfully accessed within a preset time, sending a secondary paging message to the MTC devices, wherein the secondary paging message carries a third uplink time-frequency resource, namely, a bearer Msg3 is allocated to the MTC devices again1And the third uplink time-frequency resource of the message improves the successful access probability of the MTC equipment.
Optionally, when the MTC device in the group fails, the MTC device stops working within a period of time, and the base station cannot successfully access the MTC device after the second paging, the MTC device is considered to be "lost" from the group, the base station deletes the member index of the MTC device from the group, and after the MTC device recovers to normal, the MTC device should perform initial random access to report its information to obtain a regrouping.
Fig. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention, and as shown in fig. 6, the base station includes:
a grouping module 301, configured to divide at least two MTC devices into at least two groups of MTC devices;
a group length selection module 302, configured to select a group length device corresponding to each group of MTC devices;
a receiving module 303, configured to receive a random access request message sent by a group leader device on behalf of another MTC device in a group to which the group leader belongs, where the random access request message includes a first random access preamble, and the random access request message is a message sent by the group leader on behalf of the group leader by the MTC device;
a first sending module 304, configured to send a first random access response message to the group leader device, so that the group leader device and other MTC devices in the MTC device group where the group leader device is located perform random access to the network according to the first random access response message.
Optionally, the grouping module 301 is specifically configured to:
acquiring service characteristic information of at least two MTC devices, wherein the service characteristic information comprises at least one of the following characteristic information: power level, path delay.
And dividing the at least two MTC devices into at least two groups of MTC device groups according to the service characteristic information of the at least two MTC devices.
Optionally, the service characteristics further include: an initial timing correction value for each MTC device,
a grouping module 301, further configured to:
and determining group leader equipment according to the initial timing correction value corresponding to each MTC equipment in the MTC equipment group.
Further, fig. 7 is a schematic structural diagram of a base station according to another embodiment of the present invention, and as shown in fig. 7, for the base station, the base station may further include:
a second sending module 305, configured to send a random access priority threshold to the group leader device before the receiving module 303 receives the random access request message sent by the group leader device, so that the group leader device determines whether to initiate random access according to the random access priority threshold.
Further, as shown in fig. 7, for the base station, it may further include:
a determining module 306, configured to determine, before the receiving module 303 receives the random access request message sent by the group leader device, a first random access preamble for random contention access by the MTC device in a second random access preamble, so that the group leader device selects a preamble for random access from the first random access preamble, where the second random access preamble is a preamble for random contention access in the LTE system.
Further, the first sending module 304 is specifically configured to:
sending a first random access response message to the group leader equipment, wherein the first random access response message comprises: the first uplink time-frequency resource indication is used for informing the group leader equipment of a first uplink time-frequency resource required for sending a first competition resolution message, so that the group leader equipment sends the first competition resolution message to the base station on the first uplink time-frequency resource according to the first timing correction value, the first competition resolution message carries the first temporary cell wireless network mark number, and the first competition resolution message is used for the group leader equipment to request random access to a network;
receiving a first competition resolution message, wherein the first competition resolution message carries a first temporary cell wireless network identification number;
and sending a first competition result message to the group leader equipment according to the first temporary cell wireless network identification number, wherein the first competition result message is used for informing the group leader equipment whether to randomly access the network.
Further, as shown in fig. 7, for the base station, it may further include:
an allocating module 307, configured to allocate a group identification ID to each group of MTC devices, where the first contention resolution message carries a group ID of an MTC device group in which a group leader device is located;
the first sending module 304 is further configured to:
after receiving the first contention resolution message, the base station sends a second random access response message to each of the other MTC devices in the group of MTC devices in which the group leader device is located according to the group ID, so that the other MTC devices in the group in which the group leader device is located perform random access to the network according to the first random access response message.
Further, the first sending module 304 is specifically configured to:
respectively sending a second random access response message to other MTC equipment in the MTC equipment group where the group leader equipment is located according to the group ID, wherein the second random access response message comprises: the MTC equipment determines a second temporary cell wireless network identification number corresponding to the MTC equipment according to the first temporary cell wireless network identification number, the second uplink time-frequency resource indication is used for informing the MTC equipment of second uplink time-frequency resources required by sending a second competition resolution message, so that the MTC equipment sends the second competition resolution message to the base station on the second uplink time-frequency resources according to the second timing correction value, the second competition resolution message carries the second temporary cell wireless network identification number, and the second competition resolution message is used for requesting the MTC equipment to randomly access the network;
the receiving module 303 is further configured to:
receiving a second competition resolution message, wherein the second competition resolution message carries a second temporary cell wireless network identification number;
the first sending module 304 sends a second contention result message to the MTC device according to the second temporary cell radio network identification number, where the second contention result message is used to notify the MTC device whether the MTC device can randomly access the network.
Optionally, the allocating module 307 is further configured to: and allocating an index number to each MTC device in the MTC device group, so that the MTC device determines a second temporary cell wireless network identification number according to the first temporary cell wireless network identification number and the MTC device index number.
Optionally, the determining module 306 is further configured to determine the number of MTC devices in the group in which the group leader device is located before the first sending module 304 sends the random access response message to the group leader device;
the allocating module 307 is further configured to allocate a first uplink time-frequency resource and a second uplink time-frequency resource to the group of MTC devices according to the number of the MTC devices.
The base station provided in this embodiment may be configured to execute the technical solution of the method embodiment shown in fig. 2, and the implementation principle and the technical effect are similar, which are not described herein again.
In terms of hardware implementation, each unit in the foregoing embodiments may be embedded in a processor of the base station in a hardware form or may be independent from the processor of the base station, and may also be stored in a memory of the base station in a software form, so that the processor invokes and executes operations corresponding to each unit, where the processor may be a CPU, a microprocessor, a single chip, or the like.
Fig. 8 is a schematic structural diagram of a base station according to still another embodiment of the present invention, the base station provided in this embodiment is configured to execute the MTC device access method shown in fig. 2, and the base station includes: memory 401, processor 402, receiver 403, transmitter 404, and bus system 405.
The memory 401, the processor 402, the receiver 403 and the transmitter 404 are coupled together by a bus system 405, wherein the bus system 405 may include a power bus, a control bus, a status signal bus, etc. in addition to a data bus. For clarity of illustration, however, the various buses are labeled in the figure as the bus system 405.
The memory 401 is used to store a set of codes for controlling the processor 402, the receiver 403 and the transmitter 404 to perform the following actions:
a processor 402, configured to divide at least two MTC devices into at least two MTC device groups by a base station;
the processor 402 is further configured to select a group leader device corresponding to each MTC device group;
a receiver 403, configured to receive a random access request message sent by a group leader device on behalf of other MTC devices in a group to which the group leader belongs, where the random access request message includes a first random access preamble, and the random access request message is a message sent by the group leader on behalf of an MTC device group to which the group leader belongs;
a transmitter 404, configured to send a first random access response message to the group leader device, so that the group leader device and other MTC devices in the MTC device group where the group leader device is located perform random access to a network according to the first random access response message.
Optionally, the dividing of the at least two MTC devices into at least two MTC device groups specifically includes:
acquiring service characteristic information of the at least two MTC devices, wherein the service characteristic information comprises at least one of the following characteristic information: power level, path delay.
And dividing the at least two MTC devices into at least two MTC device groups according to the service characteristic information of the at least two MTC devices.
Optionally, the service characteristics further include: an initial timing correction value for each MTC device,
selecting a group leader device corresponding to each MTC device group, specifically comprising:
and determining the group leader equipment according to the initial timing correction value corresponding to each MTC equipment in the MTC equipment group.
Optionally, before receiving the random access request message sent by the group leader device, the method further includes:
the transmitter 404 transmits a random access priority threshold to the group leader device, so that the group leader device determines whether to initiate random access according to the random access priority threshold.
Optionally, before receiving the random access request message sent by the group leader device, the method further includes: the processor 402 determines a first random access preamble for random contention access of MTC devices in a second random access preamble, so that the group leader device selects a preamble for random access from the first random access preamble, where the second random access preamble is a preamble for random contention access in an LTE system.
Optionally, sending a first random access response message to the group leader device, so that the group leader device performs a random access to a network according to the first random access response message, includes:
a transmitter 404, further configured to transmit a first random access response message to the group leader device, where the first random access response message includes: a first timing correction value, a first uplink time-frequency resource and a first temporary cell wireless network mark number, so that the group leader device sends a first competition resolution message to the first uplink time-frequency resource according to the first timing correction value, wherein the first competition resolution message carries the first temporary cell wireless network mark number, and is used for the group leader device to request a random access network;
a receiver 403, further configured to receive the first contention resolution message, where the first contention resolution message carries the first temporary cell radio network identification number;
the transmitter 404 is further configured to send a first contention result message to the group leader device according to the first temporary cell radio network identification number, where the first contention result message is used to notify the group leader device whether to randomly access the network.
Optionally, the processor 402 is further configured to allocate a group ID to each group of MTC devices, where the first contention resolution message carries the group ID of the MTC device group where the group leader device is located;
sending a first random access response message to the group leader device, so that other MTC devices in the group to which the group leader belongs perform random access to the network according to the first random access response message, including:
after receiving the first contention resolution message, respectively sending a second random access response message to each of the other MTC devices in the MTC device group in which the group leader device is located according to the group ID, so that the other MTC devices in the group in which the group leader device is located perform random access to the network according to the first random access response message.
Optionally, the sending, according to the group ID, a second random access response message to each other MTC device in the MTC device group where the group leader device is located, so that the other MTC devices in the MTC device group where the group leader device is located perform random access to the network according to the first random access response message includes:
the transmitter 404 is further configured to send second random access response messages to other MTC devices in the MTC device group in which the group leader device is located according to the group ID, where the second random access response messages include: a second timing correction value, a second uplink time-frequency resource and a first temporary cell wireless network identification number, so that the MTC device determines a second temporary cell wireless network identification number corresponding to the MTC device according to the first temporary cell wireless network identification number, where the second random access response message is used for the MTC device to send a second contention resolution message to the second uplink time-frequency resource according to the second timing correction value, where the second contention resolution message carries the second temporary cell wireless network identification number, and the second contention resolution message is used for the MTC device to request a random access network;
a receiver 403, further configured to receive the second contention resolution message, where the second contention resolution message carries the second temporary cell radio network identification number;
the transmitter 404 is further configured to send a second contention result message to the MTC device according to the second temporary cell radio network identification number, where the second contention result message is used to notify the MTC device whether the MTC device can randomly access the network.
Optionally, the processor 402 is further configured to allocate an index number to each MTC device in the MTC device group, so that the MTC device determines the second temporary cell radio network identification number according to the first temporary cell radio network identification number and the MTC device index number.
Optionally, before sending the random access response message to the group leader device, the method further includes:
the processor 402 is further configured to determine the number of MTC devices in the group of the group leader device;
the processor 402 is further configured to allocate the first uplink time-frequency resource and the second uplink time-frequency resource to the group of MTC devices according to the number of the MTC devices.
The base station provided in this embodiment may be configured to execute the technical solution of the method embodiment shown in fig. 2, and the implementation principle and the technical effect are similar, which are not described herein again.
An embodiment of the present invention further provides an MTC device access system, including: a plurality of MTC devices and a base station as provided in the above embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (21)

  1. A random access method of MTC equipment is characterized by comprising the following steps:
    the base station divides at least two MTC (machine type communication) devices into at least two MTC device groups;
    the base station selects group length equipment corresponding to each MTC equipment group;
    the base station receives a random access request message sent by the group leader equipment on behalf of other MTC equipment in a group where the group leader is located, wherein the random access request message comprises a first random access lead code, and the random access request message is a message sent by the group leader on behalf of the group leader MTC equipment;
    and the base station sends a first random access response message to the group leader equipment so as to enable the group leader equipment and other MTC equipment in an MTC equipment group where the group leader equipment is located to perform random access to a network according to the first random access response message.
  2. The method of claim 1, wherein the base station divides at least two MTC devices into at least two MTC device groups, comprising:
    the base station acquires service characteristic information of the at least two MTC devices, wherein the service characteristic information comprises at least one of the following characteristic information: power class, path delay;
    the base station divides the at least two MTC devices into at least two MTC device groups according to the service characteristic information of the at least two MTC devices.
  3. The method of claim 2, wherein the traffic characteristics further comprise: an initial timing correction value for each MTC device,
    the base station selects group length equipment corresponding to each MTC equipment group, and the group length equipment comprises:
    and the base station determines the group length equipment according to the initial timing correction value corresponding to each MTC equipment in the MTC equipment group.
  4. The method according to any of claims 1-3, wherein before the base station receives the random access request message sent by the group leader device, the method further comprises:
    the base station sends a random access priority threshold value to the group leader equipment so that the group leader equipment determines whether random access can be initiated according to the random access priority threshold value.
  5. The method according to any of claims 1-4, wherein before the base station receives the random access request message sent by the group leader device, the method further comprises: the base station determines a first random access lead code used for random contention access of MTC (machine type communication) equipment in a second random access lead code, so that the group leader equipment selects the lead code used for random access from the first random access lead code, and the second random access lead code is the lead code used for random contention access in a Long Term Evolution (LTE) system.
  6. The method according to any of claims 1-5, wherein the base station sending a first random access response message to the group leader device to enable the group leader device to perform random access to the network according to the first random access response message comprises:
    the base station sends a first random access response message to the group leader equipment, wherein the first random access response message comprises: a first timing correction value, a first uplink time-frequency resource indication and a first temporary cell radio network identifier number, where the first uplink time-frequency resource indication is used to notify the group leader device of a first uplink time-frequency resource required for sending a first contention resolution message, so that the group leader device sends the first contention resolution message to the base station on the first uplink time-frequency resource according to the first timing correction value, where the first contention resolution message carries the first temporary cell radio network identifier number, and the first contention resolution message is used for the group leader device to request a random access network;
    the base station receives the first competition resolution message, wherein the first competition resolution message carries the wireless network identification number of the first temporary cell;
    and the base station sends a first competition result message to the group leader equipment according to the first temporary cell wireless network identification number, wherein the first competition result message is used for informing the group leader equipment whether to randomly access the network.
  7. The method according to claim 6, wherein the base station allocates a group identification ID for each group of MTC devices, and the first contention resolution message carries a group ID of an MTC device group in which the group leader device is located;
    the base station sends a first random access response message to the group leader device so that other MTC devices in the group of the group leader perform random access to the network according to the first random access response message, and the method comprises the following steps:
    after the base station receives the first contention resolution message, the base station sends a second random access response message to each of the other MTC devices in the MTC device group in which the group leader device is located according to the group ID, so that the other MTC devices in the group in which the group leader device is located perform random access to the network according to the first random access response message.
  8. The method according to claim 7, wherein the sending, by the base station, a second random access response message to each of the other MTC devices in the MTC device group to which the group leader device belongs according to the group ID, so that the other MTC devices in the MTC device group to which the group leader device belongs perform random access to the network according to the first random access response message, comprises:
    the base station respectively sends second random access response messages to other MTC devices in the MTC device group where the group leader device is located according to the group ID, wherein the second random access response messages comprise: a second timing correction value, a second uplink time-frequency resource indication and a first temporary cell wireless network mark number, so that the MTC device determines a second temporary cell wireless network mark number corresponding to the MTC device according to the first temporary cell wireless network mark number, the second uplink time-frequency resource indication is used to notify the MTC device of a second uplink time-frequency resource required for sending a second contention resolution message, so that the MTC device sends the second contention resolution message to the base station on the second uplink time-frequency resource according to the second timing correction value, the second contention resolution message carries the second temporary cell wireless network mark number, and the second contention resolution message is used for the MTC device to request a random access network;
    the base station receives the second competition resolution message, wherein the second competition resolution message carries the wireless network identification number of the second temporary cell;
    and the base station sends a second competition result message to the MTC equipment according to the second temporary cell wireless network identification number, wherein the second competition result message is used for informing the MTC equipment whether the MTC equipment can randomly access the network.
  9. The method according to claim 8, wherein the base station allocates an index number to each MTC device in the group of MTC devices, so that the MTC device determines the second temporary cell radio network identification number according to the first temporary cell radio network identification number and the MTC device index number.
  10. The method according to any of claims 1-9, wherein before the base station sends the random access response message to the group leader device, the method further comprises:
    the base station determines the number of MTC devices in a group where the group leader device is located;
    and the base station allocates the first uplink time-frequency resource and the second uplink time-frequency resource for the MTC equipment in the group according to the number of the MTC equipment.
  11. A base station, comprising:
    the grouping module is used for grouping the at least two MTC (machine type communication) devices into at least two groups of MTC device groups;
    the group length selection module is used for selecting group length equipment corresponding to each MTC equipment group;
    a receiving module, configured to receive a random access request message sent by a group leader device on behalf of other MTC devices in a group to which the group leader device belongs, where the random access request message includes a first random access preamble, and the random access request message is a message sent by the group leader on behalf of the group to which the group leader device belongs;
    a first sending module, configured to send a first random access response message to the group leader device, so that the group leader device and other MTC devices in the MTC device group where the group leader device is located perform random access to a network according to the first random access response message.
  12. The base station of claim 11, wherein the grouping module is specifically configured to:
    acquiring service characteristic information of the at least two MTC devices, wherein the service characteristic information comprises at least one of the following characteristic information: power class, path delay;
    and dividing the at least two MTC devices into at least two MTC device groups according to the service characteristic information of the at least two MTC devices.
  13. The base station of claim 12, wherein the traffic characteristics further include: an initial timing correction value for each MTC device,
    the grouping module is further configured to:
    and determining the group leader equipment according to the initial timing correction value corresponding to each MTC equipment in the MTC equipment group.
  14. The base station according to any of claims 11-13, further comprising:
    a second sending module, configured to send a random access priority threshold to the group leader device before the receiving module receives the random access request message sent by the group leader device, so that the group leader device determines whether random access can be initiated according to the random access priority threshold.
  15. The base station according to any of claims 11-14, further comprising:
    a determining module, configured to determine, before the receiving module receives the random access request message sent by the group leader device, a first random access preamble for random contention access by the MTC device in a second random access preamble, so that the group leader device selects a preamble for random access from the first random access preamble, where the second random access preamble is a preamble for random contention access in a long term evolution LTE system.
  16. The base station according to any of claims 11 to 15, wherein the first sending module is specifically configured to:
    sending a first random access response message to the group leader device, where the first random access response message includes: a first timing correction value, a first uplink time-frequency resource indication and a first temporary cell radio network identifier number, where the first uplink time-frequency resource indication is used to notify the group leader device of a first uplink time-frequency resource required for sending a first contention resolution message, so that the group leader device sends the first contention resolution message to the base station on the first uplink time-frequency resource according to the first timing correction value, where the first contention resolution message carries the first temporary cell radio network identifier number, and the first contention resolution message is used for the group leader device to request a random access network;
    receiving the first competition resolution message, wherein the first competition resolution message carries the wireless network identification number of the first temporary cell;
    and sending a first competition result message to the group leader device according to the first temporary cell radio network identification number, wherein the first competition result message is used for informing the group leader device whether the group leader device can randomly access the network.
  17. The base station of claim 16, further comprising: a distribution module, configured to distribute a group identifier ID for each group of MTC devices, where the first contention resolution message carries a group ID of an MTC device group in which the group leader device is located;
    the first sending module is further configured to:
    after receiving the first contention resolution message, the base station sends a second random access response message to each of the other MTC devices in the group of MTC devices in which the group leader device is located according to the group ID, so that the other MTC devices in the group in which the group leader device is located perform random access to the network according to the first random access response message.
  18. The base station of claim 17, wherein the first sending module is specifically configured to:
    respectively sending second random access response messages to other MTC devices in an MTC device group where the group leader device is located according to the group ID, wherein the second random access response messages comprise: a second timing correction value, a second uplink time-frequency resource indication and a first temporary cell wireless network mark number, so that the MTC device determines a second temporary cell wireless network mark number corresponding to the MTC device according to the first temporary cell wireless network mark number, the second uplink time-frequency resource indication is used to notify the MTC device of a second uplink time-frequency resource required for sending a second contention resolution message, so that the MTC device sends the second contention resolution message to the base station on the second uplink time-frequency resource according to the second timing correction value, the second contention resolution message carries the second temporary cell wireless network mark number, and the second contention resolution message is used for the MTC device to request a random access network;
    the receiving module is further configured to:
    receiving the second competition resolution message, wherein the second competition resolution message carries the wireless network identification number of the second temporary cell;
    the first sending module sends a second competition result message to the MTC device according to the second temporary cell wireless network identification number, wherein the second competition result message is used for informing the MTC device whether the MTC device can randomly access the network.
  19. The base station of claim 18, wherein the assignment module is further configured to: allocating an index number to each MTC device in the MTC device group, so that the MTC device determines the second temporary cell wireless network identification number according to the first temporary cell wireless network identification number and the MTC device index number.
  20. The base station according to any of claims 11 to 19, wherein the determining module is further configured to determine the number of MTC devices in the group in which the group leader device belongs before the first sending module sends the random access response message to the group leader device;
    the allocation module is further configured to allocate the first uplink time-frequency resource and the second uplink time-frequency resource to the group of MTC devices according to the number of the MTC devices.
  21. An MTC device access system comprising a plurality of MTC devices and a base station according to any one of claims 11 to 20.
CN201580079030.9A 2015-05-20 2015-05-20 MTC device cut-in method, base station and system Pending CN107534998A (en)

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