CN102036407A - Method and system of realizing random access - Google Patents
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Abstract
The invention provides a method and a system of realizing random access. In the method, UE (user equipment) can select each retaining descending component carrier wave through the information of other descending component carrier waves with different PRACH (Physical Random Access Channel) resources from the initial residing descending component carrier wave carried in the system information transmitted by the network side; the random access is carried out by selecting the ascending component carrier waves corresponding to the retaining descending component carrier waves; the partial UE retaining in the initial retaining carrier wave is successfully shunted to other selected descending component carrier waves to guarantee the load balance of the access; the carrier wave resources are reasonably distributed; and the probability that the random access of the UE generates the congestion on one ascending component carrier wave is reduced.
Description
Technical Field
The present invention relates to an LTE-Advanced (Long-Term Evolution advance, LTE-a for short) system, and more particularly, to a method and system for implementing random access.
Background
Fig. 1 is a schematic diagram of a cellular wireless communication system, which is mainly composed of a terminal, a base station and a core network, as shown in fig. 1. A network formed by base stations is called a Radio Access Network (RAN) and is used for managing access layer transactions such as Radio resources. There may be physical or logical connections between base stations, such as base station 1 and base station 2 in fig. 1, or base station 1 and base station 3, depending on the actual situation. Each base station may be connected to one or more Core Network nodes (CN). The core network is used for being responsible for non-access stratum transactions such as location updating and the like and is an anchor point of a user plane. A terminal (UE) refers to various devices, such as a mobile phone or a notebook computer, which can communicate with a cellular wireless communication network.
In order to meet the increasing demand for high-speed mobile access with large bandwidth, the LTE-a standard was introduced by the Third Generation Partnership project (3 GPP). The LTE-a system aggregates several carriers to support higher bandwidth, thereby obtaining higher data rates. Each aggregated carrier is called a Component Carrier (CC), and component carriers may be continuous or discontinuous.
A downlink component carrier (DL CC) in the LTE-a system may include a synchronization Channel and a Broadcast Channel (PBCH), wherein the synchronization Channel includes a primary synchronization Channel and a secondary synchronization Channel. A broadcast channel on one downlink component carrier refers to a channel carrying broadcast messages of a certain carrier or certain carriers or an entire cell, which messages can be received by all terminals in the cell or all terminals in the cell having a certain same property. The broadcast channel may refer to a physical channel of a physical layer, a transport channel of a Medium Access Control (MAC) sublayer, or a logical channel of a radio resource management (RRC) sublayer. The Information carried by the broadcast channel may also be referred to as System Information (System Information). The information broadcasted by the broadcast channel is various, and may include (1) a frequency point of an uplink carrier and a bandwidth of the uplink carrier; (2) and the configuration parameters of the physical random access channel corresponding to the uplink carrier. Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS) are information carried on Primary and secondary Synchronization channels, respectively. PSS, SSS, PBCH, and System Information Block (SIB) need to be configured on each DL CC.
The random access procedure for a terminal of the LTE system release Rel8 is roughly as follows:
the UE performs cell search with a frequency raster of 100kHz (raster); the UE detects PSS/SSS/PBCH on a DL CC and receives SIB; usually, this DL CC is the strongest DL CC.
The UE configures resources according to a Physical Random Access Channel (PRACH) carried in the received DL CC and sends a Preamble code to the base station; the UE receives a Random Access Channel (RACH) response message of a DL CC matched with an UL CC transmitting a Preamble.
If the above Rel8 release random access procedure is still adopted in the carrier aggregation scenario of LTE-a, when a certain DL CC signal is strongest, many UEs may select the DL CC as a camping carrier during cell search. At this time, since the SIB only includes PRACH configuration information of the UL CC corresponding to the DL CC, most UEs can only access the UL CC, so that PRACH resource congestion of a certain UL CC occurs, and a phenomenon of load imbalance occurs in which only few users access other UL CCs.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a method for implementing random access, which can ensure load balancing of access and reasonably allocate carrier resources.
Another objective of the present invention is to provide a system for implementing random access, which can ensure load balance of access and reasonably allocate carrier resources.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method of implementing random access, comprising:
setting information of other downlink component carriers which have different PRACH resources with the initially residing downlink component carrier in a System Information Block (SIB) of the initially residing downlink component carrier, and issuing the information to a User Equipment (UE) which selects to access the initially residing downlink carrier;
and the UE selects the respective resident downlink component carrier according to the received downlink component carrier information carried in the SIB and carries out random access through the uplink component carrier corresponding to the selected downlink component carrier.
The information of other downlink component carriers additionally set in the SIB is: the cell identification number corresponding to the downlink component carrier with different PRACH resources with the initially resided downlink component carrier; and the number of the first and second groups,
the center frequency of other downlink component carriers which are positioned in a continuous frequency band with the initial resident downlink component carrier and have different PRACH configuration information; and/or the presence of a gas in the gas,
and the bandwidth of other downlink component carriers which are positioned in a continuous frequency band together with the initially resided downlink component carrier and have different PRACH configuration information.
The SIB issuing method is broadcasting.
The UE selects the downlink component carriers which reside respectively as follows:
the UE randomly selects one downlink component carrier to reside in the downlink component carriers broadcasted in the SIB of the initial resident downlink component carrier; or,
and the UE selects one downlink component carrier to reside according to a preset random selection strategy.
The random selection strategy is as follows:
selecting a downlink component carrier with the number of N to reside according to the formula IMSI MOD N ═ N; wherein, N is the number of downlink component carriers; n is the number of N downlink component carriers, and the value is 0 to (N-1); the IMSI is an IMSI number of the UE; MOD is the modulus operator.
The method for acquiring the number N of the N downlink component carriers comprises the following steps: the numbers of the downlink component carriers are 0-N-1 from low to high in sequence.
The random access of the UE through the uplink component carrier corresponding to the selected downlink component carrier is as follows:
for the UE which is selected to reside on the initial resident downlink component carrier, acquiring corresponding uplink component carrier and PRACH resource configuration information from the SIB on the downlink carrier; carrying out a random access process on the corresponding uplink component carrier according to the PRACH configuration information;
for UE which selects other downlink component carriers to reside, reading SIB of the downlink component carrier, and acquiring uplink component carrier corresponding to the downlink component carrier and PRACH configuration information thereof; and performing a random access process on the corresponding uplink component carrier according to the PRACH configuration information.
A system for implementing random access includes at least a network side and a UE, wherein,
a network side, configured to set, in an SIB of an initially camped downlink component carrier, information of a downlink component carrier having a PRACH resource different from that of the initially camped downlink component carrier, and send the information to a UE that selects to access the initially camped downlink carrier;
and the UE is used for selecting the downlink component carrier residing in the UE according to the received downlink component carrier information carried in the SIB and carrying out random access through the uplink component carrier corresponding to the selected downlink component carrier.
The information of other downlink component carriers additionally set in the SIB is: the cell identification number corresponding to the downlink component carrier with different PRACH resources with the initially resided downlink component carrier; and the number of the first and second groups,
the center frequency of other downlink component carriers which are positioned in a continuous frequency band with the initial resident downlink component carrier and have different PRACH configuration information; and/or the presence of a gas in the gas,
and the bandwidth of other downlink component carriers which are positioned in a continuous frequency band together with the initially resided downlink component carrier and have different PRACH configuration information.
And the network side issues the SIB by broadcasting.
It can be seen from the above technical solutions provided by the present invention that, in the method of the present invention, the UE can select the respective resident downlink component carrier through the information of other downlink component carriers having different PRACH resources from the initially resident downlink component carrier, which is carried in the system message issued by the network side, and successfully distribute part of the UE resident in the initially resident carrier to the other selected downlink component carriers by selecting the uplink component carrier corresponding to the resident downlink component carrier for random access, thereby ensuring load balance of access, reasonably allocating carrier resources, and reducing the probability of congestion of the UE in random access on one uplink component carrier.
Drawings
FIG. 1 is a schematic diagram of a cellular wireless communication system;
FIG. 2 is a flow chart of a method for implementing random access according to the present invention;
FIG. 3 is a diagram of a system for implementing random access according to the present invention;
FIG. 4 is a diagram illustrating a corresponding relationship between DL CCs and UL CCs according to a first embodiment of the present invention;
fig. 5 is a diagram illustrating the corresponding relationship between DL CCs and UL CCs in the second, third, fourth and fifth embodiments of the present invention.
Detailed Description
Fig. 2 is a flowchart of a method for implementing random access according to the present invention, as shown in fig. 2, including the following steps:
step 200: and setting the information of the downlink component carrier with different PRACH resources from the downlink component carrier initially resided in the SIB of the downlink component carrier initially resided in, and sending the information to the UE which selects to access the downlink component carrier initially resided in. Here, the downlink component carrier having different PRACH resources from the initially camped downlink component carrier is: and the downlink component carrier except the initially resident downlink carrier is carried in the system message sent by the network side.
The adding, in the SIB, information of the downlink component carrier having a different PRACH resource from the initially camped downlink component carrier may include: cell identification numbers (Cell-IDs) corresponding to these DL CCs, and,
center frequencies (DL-CarrierFreq) of other DL CCs having different PRACH configuration information, which are in a continuous frequency band with the initially camped DL CC; and/or the presence of a gas in the gas,
bandwidth (DL-Bandwidth) of other DL CCs having different PRACH configuration information, which are in a continuous band with the initially camped DL CC.
In this step, the SIB of the initially camped downlink ccs carries information of the downlink ccs in the system including the initially camped downlink ccs.
In this step, the SIB is issued in a broadcast manner.
Step 201: and the UE selects the respective resident downlink component carrier according to the received downlink component carrier information carried in the SIB.
Suppose that the number of the N downlink component carriers is 0 to (N-1) from the low to the high of the center frequency, wherein the N includes the initially residing downlink component carrier, and N is the number of the downlink component carriers. In this step, the UE selects the respective resident downlink component carrier as:
the UE randomly selects one downlink component carrier from a plurality of downlink component carriers broadcasted in an SIB of an initially resident downlink component carrier to reside; or,
the UE selects a downlink component carrier for camping according to a preset random selection policy, where the preset random selection policy may be: the UE selects a downlink component carrier with the number of N to reside according to the formula of IMSI MOD N ═ N, wherein N is the number of N downlink component carriers and takes the value of 0 to (N-1), the IMSI is the IMSI number of the UE, and MOD is a modulus operator.
Step 202: and the UE carries out random access through the uplink component carrier corresponding to the selected downlink component carrier.
For the UE which still selects to reside on the initially resident downlink component carrier, the UE acquires the corresponding uplink component carrier and PRACH resource configuration information from the SIB on the downlink carrier; and performing a random access process on the corresponding uplink component carrier according to the PRACH configuration information.
For UE which selects other downlink component carriers (non-initial resident carriers) to reside, the UE reads SIB of the downlink component carrier and acquires UL CC corresponding to DL CC and PRACH configuration information thereof; and performing a random access process on the corresponding UL CC according to the PRACH configuration information.
In the method, the UE can select the respectively resident downlink component carrier through the information of other downlink component carriers in a system which is issued by a network side and has different PRACH resources from the initially resident downlink component carrier, and can successfully shunt part of the UE resident in the initially resident carrier to other selected downlink component carriers by selecting the uplink component carrier corresponding to the resident downlink component carrier for random access, thereby ensuring the load balance of access, reasonably distributing carrier resources and reducing the probability of congestion of random access of the UE on one ULCC.
Aiming at the method of the invention, a system for implementing random access is also provided, fig. 3 is a schematic diagram of the system for implementing random access of the invention, at least comprising a network side and a UE, wherein,
a network side, configured to set, in an SIB of an initially camped downlink component carrier, information of a downlink component carrier having a PRACH resource different from that of the initially camped downlink component carrier, and send the information to a UE that selects to access the initially camped downlink carrier; here, the downlink component carrier having different PRACH resources from the initially camped downlink component carrier is: and the downlink component carrier except the initially resident downlink carrier is carried in the system message sent by the network side.
And the UE is used for selecting the downlink component carrier residing in the UE according to the received downlink component carrier information carried in the SIB and carrying out random access through the uplink component carrier corresponding to the selected downlink component carrier.
And the network side issues the SIB by broadcasting.
The process of the present invention will be described in detail with reference to examples.
Fig. 4 is a diagram illustrating a corresponding relationship between DL CCs and UL CCs according to a first embodiment of the present invention, where, as shown in fig. 4, an upper dotted line indicates a downlink, a lower dotted line indicates an uplink, and a large blank square indicates a component carrier; the left hatching indicates SCH/BCH, the right hatching indicates PRACH, and the small hatching indicates PUCCH. In the first embodiment, there are 3 DL CCs in the system, DL CC # 0, DL CC # 1 and DL CC # 2, and 3 UL CCs, UL CC # 0, UL CC # 1 and UL CC # 2, one DL CC for each UL CC. Suppose there are 3 terminals UE # 0 with IMSI numbers IMSI # 0, IMSI # 1, and IMSI # 2, UE # 1 and UE # 2 are to perform random access, and suppose that DL CC # 0 signal is strongest at this time, and 3 UEs will select it as the initial camping downlink component carrier.
Since DL CCs corresponding to UL CC # 0, UL CC # 1 and UL CC # 2 are different and PRACH resources thereof are also different, center frequencies, bandwidths and Cell-ID information of other two DL CCs, i.e., DL CC # 1 and DL CC # 2, are additionally set in an SIB initially residing in a DL CC # 0 carrier, and are broadcasted to all UEs, i.e., UE # 0, UE # 1 and UE # 2, through a broadcast channel.
Assuming that DL CC # 0, DL CC # 1 and DL CC # 2 are re-numbered from high to low according to the center frequency and correspond to numbers 0, 1 and 2, respectively, and IMSI #0MOD 3 is 0, IMSI #1MOD 3 is 1, IMSI #2MOD 3 is 2, then UE # 0, UE # 1 and UE # 2 select downlink component carriers numbered 0, 1 and 2 to camp on, respectively, i.e., UE # 0 remains on the initially camped DL CC # 0 carrier, and UE # 1 and UE # 2 reside on DL CC # 1 and DL CC # 2 carriers, respectively.
For the UE # 0 still residing on the initially residing UL CC # 0, the corresponding UL CC # 0 and PRACH configuration information may be obtained from the system information on the downlink component carrier;
for UE # 1 and UE # 2 that respectively select DL CC # 1 and DL CC #2 (non-initial camping carrier) for camping, system information of DL CC # 1 and DL CC # 2 can be read respectively, and UL CC # 1 and PRACH configuration information, UL CC # 2 and PRACH configuration information that respectively correspond to each other are obtained.
And the UE # 0, the UE # 1 and the UE # 2 carry out a random access process on the corresponding uplink component carriers according to the PRACH configuration information and the obtained uplink component carriers and the PRACH configuration information. Therefore, 2 UEs initially residing in UL CC # 0 are successfully distributed, the load balance of access is ensured, carrier resources are reasonably distributed, and the probability of congestion of random access of the UEs on one UL CC is reduced.
Fig. 5 is a schematic diagram of corresponding relationship between DL CCs and UL CCs in the second, third, fourth and fifth embodiments of the present invention, as shown in fig. 5, a dotted line above indicates a downlink, a dotted line below indicates an uplink, and a large blank square indicates a component carrier; the left hatching indicates SCH/BCH, the right hatching indicates PRACH, and the small hatching indicates PUCCH. There are 3 DL CCs in the system, DL CC # 0, DL CC # 1 and DL CC # 2, and 2 UL CCs, UL CC # 0 and UL CC # 1.
In the second embodiment, it is assumed that UL CC # 0 corresponds only to DL CC # 0, and UL CC # 1 corresponds to DL CC # 1 and DL CC # 2. Although DL CC # 1 and DL CC # 2 correspond to the same UL CC, different preambles are configured for each.
Suppose there are 3 terminals UE # 0 with IMSI numbers IMSI # 0, IMSI # 1, and IMSI # 2, UE # 1 and UE # 2 are to perform random access, and suppose that DL CC # 1 signal is strongest at this time, and 3 UEs will select it as the initial camping downlink component carrier. Since DL CC # 1 corresponds to different DL CCs from DL CC # 0, PRACH resources are also different. Meanwhile, DL CC # 1 and DL CC # 2 correspond to different preambles, and PRACH resources are different. Therefore, the center frequency, bandwidth and Cell-ID information of the other two DL CCs are set in the SIB initially camping on the DL CC # 1 carrier, and are broadcasted to all UEs, i.e., UE # 0, UE # 1 and UE # 2, through the broadcast channel.
Assuming that DL CC # 0, DL CC # 1 and DL CC # 2 are re-numbered from high to low according to the center frequency and correspond to numbers 0, 1 and 2, respectively, and IMSI #0MOD 3 is 0, IMSI #1MOD 3 is 1, IMSI #2MOD 3 is 2, then UE # 0, UE # 1 and UE # 2 select downlink component carriers numbered 0, 1 and 2 to camp on, respectively, that is, UE # 1 remains on the initially camped DL CC # 1 carrier, and UE # 0 and UE # 2 reside on DL CC # 0 and DL CC # 2 carriers, respectively.
For the UE # 1 still residing on the initially residing DL CC # 1, the corresponding uplink component carrier UL CC # 1 and PRACH configuration information may be obtained from the system information on the downlink component carrier;
for UE # 0 and UE # 2 that respectively select DL CC # 0 and DL CC #2 (non-initial camping carrier) for camping, system information of DL CC # 0 and DL CC # 2 can be read respectively, and UL CC # 0 and PRACH configuration information, UL CC # 2 and PRACH configuration information that respectively correspond to each other are obtained.
And the UE # 0, the UE # 1 and the UE # 2 carry out a random access process on the corresponding uplink component carriers according to the PRACH configuration information and the obtained uplink component carriers and the PRACH configuration information. Therefore, 2 UEs initially residing in UL CC # 0 are successfully distributed, the load balance of access is ensured, carrier resources are reasonably distributed, and the probability of congestion of random access of the UEs on one UL CC is reduced.
In the third embodiment, it is assumed that UL CC # 0 corresponds only to DL CC # 0, and UL CC # 1 corresponds to DL CC # 1 and DL CC # 2. Although DL CC # 1 and DL CC # 2 correspond to the same UL CC, each corresponds to a different Physical Resource Block (PRB).
Suppose there are 3 terminals UE # 0 with IMSI numbers IMSI # 0, IMSI # 1, and IMSI # 2, UE # 1 and UE # 2 are to perform random access, and suppose that DL CC # 1 signal is strongest at this time, and 3 UEs will select it as the initial camping downlink component carrier. Since DL CC # 1 corresponds to different DL CCs from DL CC # 0, PRACH resources are also different. Meanwhile, DL CC # 1 and DL CC # 2 correspond to different PRBs, and the PRACH resources are different. Therefore, the center frequency, bandwidth and Cell-ID information of the other two DL CCs are set in the SIB initially camping on the DL CC # 1 carrier, and are broadcasted to all UEs, i.e., UE # 0, UE # 1 and UE # 2, through the broadcast channel.
Assuming that DL CC # 0, DL CC # 1 and DL CC # 2 are re-numbered from high to low according to the center frequency and correspond to numbers 0, 1 and 2, respectively, and IMSI #0MOD 3 is 0, IMSI #1MOD 3 is 1, IMSI #2MOD 3 is 2, then UE # 0, UE # 1 and UE # 2 select downlink component carriers numbered 0, 1 and 2 to camp on, respectively, that is, UE # 1 remains on the initially camped DL CC # 1 carrier, and UE # 0 and UE # 2 reside on DL CC # 0 and DL CC # 2 carriers, respectively.
For the UE # 1 still residing on the initially residing DL CC # 1, the corresponding uplink component carrier UL CC # 1 and PRACH configuration information may be obtained from the system information on the downlink component carrier;
for UE # 0 and UE # 2 that respectively select DL CC # 0 and DL CC #2 (non-initial camping carrier) for camping, system information of DL CC # 0 and DL CC # 2 can be read respectively, and UL CC # 0 and PRACH configuration information, UL CC # 2 and PRACH configuration information that respectively correspond to each other are obtained.
And the UE # 0, the UE # 1 and the UE # 2 carry out a random access process on the corresponding uplink component carriers according to the PRACH configuration information and the obtained uplink component carriers and the PRACH configuration information. Therefore, 2 UEs initially residing in UL CC # 0 are successfully distributed, the load balance of access is ensured, carrier resources are reasonably distributed, and the probability of congestion of random access of the UEs on one UL CC is reduced.
In the fourth embodiment, it is assumed that UL CC # 0 corresponds to only DL CC # 0, UL CC # 1 corresponds to DL CC # 1 and DL CC # 2, and DL CC # 1 and DL CC # 2 have the same PRACH.
Suppose there are 3 terminals UE # 0 with IMSI numbers IMSI # 0, IMSI # 1, and IMSI # 2, UE # 1 and UE # 2 are to perform random access, and suppose that DL CC # 1 signal is strongest at this time, and 3 UEs will select it as the initial camping downlink component carrier. Since DL CC # 1 and DL CC # 0 correspond to different UL CCs, PRACH resources thereof are also different; since DL CC # 1 and UL CC # 2 correspond to the same PRACH resource, it is only necessary to add the center frequency, bandwidth and Cell-ID information of DL CC # 0 to the SIB of DL CC # 1 carrier, and broadcast the information to all UEs, i.e., UE # 0, UE # 1 and UE # 2, through a broadcast channel.
Assuming that DL CC # 0, DL CC # 1 are re-numbered from high to low according to the center frequency and correspond to numbers 0 and 1, respectively, and IMSI #0MOD 2 is 0, IMSI #1MOD 2 is 1, IMSI #2MOD 2 is 1, then UE # 0, UE # 1 and UE # 2 select downlink component carriers numbered 0, 1 and 1 to camp on, respectively, i.e., UE # 1 and UE # 2 still camp on the initially camped DL CC # 1 carrier, and UE # 0 camps on DL CC # 0 carrier.
For the UE # 1 and UE # 2 still residing on the initially residing UL CC # 1, the corresponding uplink component carrier UL CC # 1 and PRACH configuration information may be obtained from the system information on the downlink component carrier;
for UE # 0 that selects DL CC #0 (non-initial camping carrier) to camp on, the system information of DL CC # 0 may be read, and corresponding UL CC # 0 and PRACH configuration information may be acquired.
And the UE # 0, the UE # 1 and the UE # 2 carry out a random access process on the corresponding uplink component carriers according to the PRACH configuration information and the obtained uplink component carriers and the PRACH configuration information. Therefore, 3 pieces of UE initially residing in UL CC # 0 are successfully shunted out by 1 piece, the load balance of access is ensured, carrier resources are reasonably distributed, and the probability of congestion of random access of the UE on one UL CC is reduced.
In the fifth embodiment, it is assumed that UL CC # 0 corresponds to only DL CC # 0, UL CC # 1 corresponds to DL CC # 1 and DL CC # 2, and DL CC # 2 is regarded as a reserved component carrier and not as an access carrier.
Suppose there are 3 terminals UE # 0 with IMSI numbers IMSI # 0, IMSI # 1, and IMSI # 2, UE # 1 and UE # 2 are to perform random access, and suppose that DL CC # 1 signal is strongest at this time, and 3 UEs will select it as the initial camping downlink component carrier. Since DL CC # 1 corresponds to different UL CCs from DL CC # 0, the PRACH resources are different, and UL CC # 2 is used as a reserved component carrier and not as an access carrier, only the center frequency, bandwidth and Cell-ID information of DL CC # 0 are added to the SIB of DL CC # 1 carrier, and are broadcast to all UEs, i.e., UE # 0, UE # 1 and UE # 2, through a broadcast channel.
Assuming that DL CC # 0, DL CC # 1 are re-numbered from high to low according to the center frequency and correspond to numbers 0 and 1, respectively, and IMSI #0MOD 2 is 0, IMSI #1MOD 2 is 1, IMSI #2MOD 2 is 1, then UE # 0, UE # 1 and UE # 2 select downlink component carriers numbered 0, 1 and 1 to camp on, respectively, i.e., UE # 1 and UE # 2 still camp on the initially camped DL CC # 1 carrier, and UE # 0 camps on DL CC # 0 carrier.
For the UE # 1 and UE # 2 still residing on the initially residing UL CC # 1, the corresponding uplink component carrier UL CC # 1 and PRACH configuration information may be obtained from the system information on the downlink component carrier;
for UE # 0 that selects DL CC #0 (non-initial camping carrier) to camp on, the system information of DL CC # 0 may be read, and corresponding UL CC # 0 and PRACH configuration information may be acquired.
And the UE # 0, the UE # 1 and the UE # 2 carry out a random access process on the corresponding uplink component carriers according to the PRACH configuration information and the obtained uplink component carriers and the PRACH configuration information. Therefore, 3 pieces of UE initially residing in UL CC # 0 are successfully shunted out by 1 piece, the load balance of access is ensured, carrier resources are reasonably distributed, and the probability of congestion of random access of the UE on one UL CC is reduced.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (10)
1. A method for implementing random access, comprising:
setting information of other downlink component carriers which have different Physical Random Access Channel (PRACH) resources from the initially resident downlink component carrier in a System Information Block (SIB) of the initially resident downlink component carrier, and issuing the information to a User Equipment (UE) which selects to access the initially resident downlink carrier;
and the UE selects the respective resident downlink component carrier according to the received downlink component carrier information carried in the SIB and carries out random access through the uplink component carrier corresponding to the selected downlink component carrier.
2. The method of claim 1, wherein the information of the other downlink component carriers additionally set in the SIB is: the cell identification number corresponding to the downlink component carrier with different PRACH resources with the initially resided downlink component carrier; and the number of the first and second groups,
the center frequency of other downlink component carriers which are positioned in a continuous frequency band with the initial resident downlink component carrier and have different PRACH configuration information; and/or the presence of a gas in the gas,
and the bandwidth of other downlink component carriers which are positioned in a continuous frequency band together with the initially resided downlink component carrier and have different PRACH configuration information.
3. The method of claim 1, wherein the method for issuing the SIB is broadcasting.
4. The method of claim 1, wherein the UE selects the respective camping downlink component carrier as:
the UE randomly selects one downlink component carrier to reside in the downlink component carriers broadcasted in the SIB of the initial resident downlink component carrier; or,
and the UE selects one downlink component carrier to reside according to a preset random selection strategy.
5. The method of claim 4, wherein the random selection policy is:
selecting a downlink component carrier with the number of N to reside according to the formula IMSI MOD N ═ N; wherein, N is the number of downlink component carriers; n is the number of N downlink component carriers, and the value is 0 to (N-1); the IMSI is an IMSI number of the UE; MOD is the modulus operator.
6. The method according to claim 5, wherein the number N of the N downlink ccs is obtained by: the numbers of the downlink component carriers are 0-N-1 from low to high in sequence.
7. The method of claim 1, wherein the random access performed by the UE through the uplink component carrier corresponding to the selected downlink component carrier is:
for the UE which is selected to reside on the initial resident downlink component carrier, acquiring corresponding uplink component carrier and PRACH resource configuration information from the SIB on the downlink carrier; carrying out a random access process on the corresponding uplink component carrier according to the PRACH configuration information;
for UE which selects other downlink component carriers to reside, reading SIB of the downlink component carrier, and acquiring uplink component carrier corresponding to the downlink component carrier and PRACH configuration information thereof; and performing a random access process on the corresponding uplink component carrier according to the PRACH configuration information.
8. A system for implementing random access, at least comprising a network side and a UE, wherein,
the network side is used for setting the information of the downlink component carrier which has different Physical Random Access Channel (PRACH) resources from the initially resident downlink component carrier in the SIB of the initially resident downlink component carrier and sending the information to the UE which selects to access the initially resident downlink carrier;
and the UE is used for selecting the downlink component carrier residing in the UE according to the received downlink component carrier information carried in the SIB and carrying out random access through the uplink component carrier corresponding to the selected downlink component carrier.
9. The system of claim 8, wherein the information of the other downlink ccs added and set in the SIB is: the cell identification number corresponding to the downlink component carrier with different PRACH resources with the initially resided downlink component carrier; and the number of the first and second groups,
the center frequency of other downlink component carriers which are positioned in a continuous frequency band with the initial resident downlink component carrier and have different PRACH configuration information; and/or the presence of a gas in the gas,
and the bandwidth of other downlink component carriers which are positioned in a continuous frequency band together with the initially resided downlink component carrier and have different PRACH configuration information.
10. The system of claim 8, wherein the network side issues the SIB by broadcasting.
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| CN2009100937973A CN102036407A (en) | 2009-09-28 | 2009-09-28 | Method and system of realizing random access |
| PCT/CN2010/077043 WO2011035700A1 (en) | 2009-09-28 | 2010-09-17 | Method and system for implementing random access |
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| CN2009100937973A CN102036407A (en) | 2009-09-28 | 2009-09-28 | Method and system of realizing random access |
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