CN102111846A - Method for resolving uplink physical random access channel (PRACH) resource congestion in multicarrier system - Google Patents
Method for resolving uplink physical random access channel (PRACH) resource congestion in multicarrier system Download PDFInfo
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- CN102111846A CN102111846A CN200910247482XA CN200910247482A CN102111846A CN 102111846 A CN102111846 A CN 102111846A CN 200910247482X A CN200910247482X A CN 200910247482XA CN 200910247482 A CN200910247482 A CN 200910247482A CN 102111846 A CN102111846 A CN 102111846A
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Abstract
The invention discloses a method for resolving uplink physical random access channel (PRACH) resource congestion in a multicarrier system. In the method, a centre frequency, a bandwidth and a carrier identification number of other downlink component carriers (CC) in the same cell is added into the system information of each downlink CC. The method comprises the following steps that: step 1, a user terminal performs channel scanning in a certain frequency interval; step 2, after scanning one cell, the user terminal performs synchronous signal detection on the downlink CCs within the cell, and acquires the system information in a broadcasting control channel after the downlink synchronization; step 3, the user terminal carries out an initial access on one uplink CC corresponding to the synchronized downlink CC according to a PRACH resource allocation in the system information. By the invention, the user terminal is convenient to reside in other downlink CCs to further perform initial access on different uplink CCs, and uplink PRACH resource congestion caused by the situation that a large number of user terminals perform the initial access on the same uplink CC is avoided.
Description
Technical field
The invention belongs to the mobile communication technology field, relate to a kind of method that solves up PRACH resource congestion in the multicarrier system.
Background technology
Along with the development of mobile industry and to the continuous growth of mobile data services demand, people are more and more higher to the requirement of the speed of mobile communication and service quality (Qos), so before 3G (Third Generation) Moblie (3G) does not also have extensive commercialization, just begun research and development to next generation mobile communication system, wherein relatively be typically Long Term Evolution (LTE) project that third generation partner program (3GPP) starts, the available maximum spectrum bandwidth of LTE system is 20MHz (megahertz).Along with the further evolution of network, LTE-A (evolution LTE) can provide the spectral bandwidth up to 100MHz as the evolution system of LTE, supports more flexible higher-quality communication, will possess better compatibility backward to LTE simultaneously.In the LTE-A system, form carrier wave (Component Carrier, CC), a LTE user terminal can only be operated on the CC of some backward compatibility, and a LTE-A user terminal may be simultaneously operated on a plurality of CC by a plurality of.
When the carrier number of uplink and downlink polymerization is identical, should dispose all carrier wave backward compatibility LTERelease8, therefore in the LTE-A system, when up-downgoing carrier wave symmetry, each descending carrier all can configuration synchronization channel (SCH) and Physical Broadcast Channel (PBCH).
When the carrier frequency of LTE is the integral multiple of 100kHz, user terminal for firm start, LTE can carry out frequency scanning with the interval of 100kHz by certain mode, when scanning strong signal, carry out master sync signal (PSS) and auxiliary synchronous signals (SSS) detection, in case detect successfully, after down-going synchronous is finished, begin to receive the system information in the Broadcast Control Channel.User terminal carries out up initial access according to the Physical Random Access Channel in the system information (PRACH) configuration parameter.
The LTE-A system is the system of a multicarrier, can dispose a plurality of up-downgoing carrier waves, if each descending carrier all disposes SCH and PBCH, and user terminal carries out the words of scan channel according to certain specific mode, most of user terminal only carries out PSS and SSS on some identical descending carriers detection can appear, and receive the system information in the identical Broadcast Control Channel, the PRACH configuration parameter of user terminal acquisition simultaneously also is identical.Therefore a large amount of user terminals can according to identical PRACH configuration parameter with the pairing same up-link carrier of descending carrier that receives downlink system information on the access that is at war with, the PRACH resource congestion that causes this up-link carrier, and the PRACH resource free time on the pairing up-link carrier of other descending carriers causes the PRACH utilization of resources on the different up-link carriers unbalanced.
Summary of the invention
Technical problem to be solved by this invention is: a kind of method that solves up PRACH resource congestion in the multicarrier system is provided.
For solving the problems of the technologies described above, the present invention adopts following technical scheme.
A kind of method that solves up PRACH resource congestion in the multicarrier system, described method be for increasing the centre frequency of other the descending CC belong to same sub-district in the system information of each descending CC, bandwidth and carrier identification number.
As a preferred embodiment of the present invention, equal configuration synchronization channel of each descending CC and Physical Broadcast Channel.
As another kind of preferred version of the present invention, said method comprising the steps of:
After step 2, user terminal scan a sub-district, the some descending CC in the sub-district is carried out synchronization signal detection, obtain the system information in the Broadcast Control Channel after the down-going synchronous;
Step 3, after the centre frequency of user terminal other descending CC in obtaining same sub-district, bandwidth and carrier identification number, it is resident to select a descending CC to carry out, and receives the system information in the Broadcast Control Channel of resident descending CC;
Step 4, user terminal are initially inserting with the pairing up CC of described resident descending CC according to the PRACH resource distribution parameter in the system information.
As another preferred version of the present invention, the frequency interval of scan channel is 100kHz in the step 1.
As another preferred version of the present invention, synchronization signal detection described in the step 2 comprises that master sync signal detects and auxiliary synchronous signals detects.
As another preferred version of the present invention, user terminal selects a descending CC in the same sub-district to carry out resident arbitrarily in the step 3.
As another preferred version of the present invention, up CC disposes the PRACH channel.
As another preferred version of the present invention, described method is applied in the multicarrier system.
Beneficial effect of the present invention is: it increases in the system information of each descending CC except when the same sub-district outside the preceding descending CC, the centre frequency of other descending CC, bandwidth information and identification number, be convenient to resident other the descending CC of user terminal and go up the different PRACH configuration information of reception to same sub-district, on the different up CC of its correspondence, initially insert, and then avoid a large number of users terminal on a up CC, initially to insert, cause this up PRACH resource congestion.
Description of drawings
Fig. 1 is a user terminal scan channel schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Embodiment one
Present embodiment provides a kind of method that solves up PRACH resource congestion in the multicarrier system, and this method is for increasing the centre frequency of other the descending CC belong to same sub-district in the system information of each descending CC, bandwidth and carrier identification number.Equal configuration synchronization channel of each descending CC and Physical Broadcast Channel.
Said method comprising the steps of:
After step 2, user terminal scan a sub-district, the some descending CC in the sub-district is carried out synchronization signal detection, obtain the system information in the Broadcast Control Channel after the down-going synchronous;
Step 3, after the centre frequency of user terminal other descending CC in obtaining same sub-district, bandwidth and carrier identification number, it is resident to select a descending CC to carry out, and receives the system information in the Broadcast Control Channel of resident descending CC;
Step 4, user terminal are initially inserting with the pairing up CC of described resident descending CC according to the PRACH resource distribution parameter in the system information.
The frequency interval of scan channel is 100kHz in the step 1.Synchronization signal detection described in the step 2 comprises that master sync signal detects and auxiliary synchronous signals detects.User terminal selects a descending CC in the same sub-district to carry out resident arbitrarily in the step 3.Up CC disposes the PRACH channel.Described method is applied in the multicarrier system.Described Physical Broadcast Channel is the channel of physical layer, and Broadcast Control Channel is a logic channel, and system information is included in the Broadcast Control Channel.
The method of the invention increases in the system information of each descending CC except when the centre frequency of other the descending CC outside the preceding descending CC, bandwidth information and identification number, be convenient to resident the going up of user terminal and receive different PRACH configuration informations to other descending CC, on different up CC, initially insert, and then avoid a large number of users terminal on a up CC, initially to insert, cause this up PRACH resource congestion.
Embodiment two
3 descending CC are arranged in the LTE-A sub-district that present embodiment provides, and 3 up CC as shown in Figure 1, dispose PSS, SSS and PBCH on each descending carrier.According to adding in the same sub-district descending centre frequency, bandwidth and the identification number of 2 CC of other except self in the system information (SystermInformationBlockType2) of embodiment one described method in the Broadcast Control Channel of each descending CC.
For LTE user terminal and LTE-A user terminal, the sub-district is searched for by the frequency of 100KHz integral multiple.A large amount of LTE user terminal down-going synchronous are to descending CC0#, and then the system information on the reception Broadcast Control Channel; The LTE-A user terminal is known the centre frequency (d1-CarrierFreq) of descending CC1# and descending CC2# by the system information in the Broadcast Control Channel (SystemInformationBlock Type2), bandwidth (d1-bandwidth), and identification number (CC-ID).The LTE-A user terminal can be chosen a descending CC wantonly and carry out residently, as descending CC2#, and receives PRACH configuration parameter in the Broadcast Control Channel on the descending CC2#, and then initially inserts on the up CC2# of descending CC2# correspondence.
Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of disclosed embodiment and change are possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present invention or substantive characteristics, and the present invention can be with other forms, structure, layout, ratio, and realize with other elements, material and parts.
Claims (8)
1. method that solves up PRACH resource congestion in the multicarrier system is characterized in that: increase the centre frequency of other descending CC that belong to same sub-district in the system information of each descending CC, bandwidth and carrier identification number.
2. the method for up PRACH resource congestion in the solution multicarrier system according to claim 1 is characterized in that: equal configuration synchronization channel of each descending CC and Physical Broadcast Channel.
3. the method for up PRACH resource congestion is characterized in that in the solution multicarrier system according to claim 2, may further comprise the steps:
Step 1, user terminal carries out scan channel with certain frequency;
After step 2, user terminal scan a sub-district, the some descending CC in the sub-district is carried out synchronization signal detection, obtain the system information in the Broadcast Control Channel after the down-going synchronous;
Step 3, user terminal is obtaining the centre frequency of other descending CC, and after bandwidth and the carrier identification number, it is resident to select a descending CC to carry out, and receives the system information in the Broadcast Control Channel of resident descending CC;
Step 4, user terminal are initially inserting with the pairing up CC of described resident descending CC according to the PRACH resource distribution parameter in the system information.
4. the method for up PRACH resource congestion in the solution multicarrier system according to claim 3 is characterized in that: the frequency interval of scan channel is 100kHz in the step 1.
5. the method for up PRACH resource congestion in the solution multicarrier system according to claim 3 is characterized in that: synchronization signal detection described in the step 2 comprises that master sync signal detects and auxiliary synchronous signals detects.
6. the method for up PRACH resource congestion in the solution multicarrier system according to claim 3 is characterized in that: user terminal selects a descending CC in the same sub-district to carry out resident arbitrarily in the step 3.
7. the method for up PRACH resource congestion in the solution multicarrier system according to claim 3, it is characterized in that: up CC disposes the PRACH channel.
8. the method for up PRACH resource congestion in the solution multicarrier system according to claim 1, it is characterized in that: described method is applied in the multicarrier system.
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| CN103988549A (en) * | 2011-10-17 | 2014-08-13 | 英特尔公司 | Call establishment in highly congested network environment |
| CN105027652A (en) * | 2013-03-05 | 2015-11-04 | 高通股份有限公司 | Methods and apparatus to control interference |
| WO2017173892A1 (en) * | 2016-04-06 | 2017-10-12 | 中兴通讯股份有限公司 | Random access channel congestion processing method, device, and storage medium |
| WO2017219241A1 (en) * | 2016-06-21 | 2017-12-28 | 广东欧珀移动通信有限公司 | Method for signal transmission, network device and terminal device |
| WO2018170702A1 (en) * | 2017-03-20 | 2018-09-27 | Oppo广东移动通信有限公司 | System information transmission method, base station and terminal |
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| WO2018177382A1 (en) * | 2017-03-29 | 2018-10-04 | 北京佰才邦技术有限公司 | Access method and access device for shared channel |
| CN109803313A (en) * | 2017-11-17 | 2019-05-24 | 电信科学技术研究院 | A kind of jamming control method, terminal and computer readable storage medium |
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Application publication date: 20110629 |