CN101076003A - Method for selecting orthogonal code and method for building up calling therewith - Google Patents
Method for selecting orthogonal code and method for building up calling therewith Download PDFInfo
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- CN101076003A CN101076003A CN 200610082300 CN200610082300A CN101076003A CN 101076003 A CN101076003 A CN 101076003A CN 200610082300 CN200610082300 CN 200610082300 CN 200610082300 A CN200610082300 A CN 200610082300A CN 101076003 A CN101076003 A CN 101076003A
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Abstract
The method comprises: a1) dividing each orthogonal code group in orthogonal code space into multi subgroups; wherein, each subgroup corresponds to a transmission format; a2) the access network sends the broadcast message to the terminal, and the broadcast message contains the correlative parameters of subgroups; b) terminal determines a transmission format capable of being supported by itself, and according to the transmission format, selects a subgroup, and randomly selects a orthogonal code from the subgroup.
Description
Technical field
The present invention relates to the communications field, and more particularly, relate to a kind of selecting orthogonal code and use the call-establishing method of this method, it can be applied to the communication system such as OFDMA (based on the access scheme of orthogonal frequency division multiplexi) system.
Background technology
At present, the 3G mobile communication technology is ripe gradually commercial, and 3GPP2 CDMA20001XEV-DO can further provide competitive wireless access system in the coming years.But want to keep following 10 years or the competitiveness in decades, need to introduce new wireless access technology.At present industry is reached preliminary unanimity with regard to the technology of the eating dishes without rice or wine evolution of 3GPP2, promptly is divided into two stages to carry out, that is, the stage one is adopted the multi-carrier EV-DO technology, more consider compatible, the evolution items of short-term just; Second stage is to introduce more advanced technology, such as OFDM technology, MIMO technology etc., can improve the spectrum efficiency and the peak rate of wireless access system greatly, is the evolution plan of 3GPP2 standard long-term.
Traditional multicarrier modulation system is that high-speed data-flow is formed the data flow of a plurality of low speed by serial to parallel conversion, and then modulates corresponding carrier wave respectively, thereby constitutes the parallel transmission system that sends of a plurality of low-rate datas.Wherein, a plurality of carrier waves that are used to modulate show as a plurality of nonoverlapping subcarriers on frequency band.
The OFDM technology is a kind of special multi-carrier modulation technology, have between each subcarrier 1/2 overlapping, but keep mutually orthogonal, receiving terminal can by the correlation demodulation technical point from, constitute data transmission system more efficiently.The OFDM technology can improve spectrum efficiency greatly, utilizes the DSP hardware of FFT and IFFT to realize simultaneously, can simplify the realization of ofdm system greatly.Ofdm system can also reduce intersymbol interference in addition, makes full use of frequency selectivity.Because the plurality of advantages of OFDM technology is so the OFDM technology is widely used at present.
The OFDMA system utilizes the OFDM technology to do multiplex technique, promptly by distributing different data subcarriers to distinguish different users to different user.Because transfer of data is used different mutually orthogonal subcarriers between the user, so transfer of data can the phase mutual interference between the user.And when subcarrier is distributed, can be fully reliable this user's wireless environment situation, make full use of frequency selectivity, distribute the data subcarrier of the most suitable transmission to the user, by the allocation schedule optimization Algorithm, can be so that power system capacity improves.
In existing OFDMA system, the WiMAX that proposes such as QualCom company inserts in standard 802.20 systems, call establishment is roughly as follows: Radio Access Network is at first caught in the wireless access terminal, and obtain relevant system message, for example sector auxiliary information (comprises sector PN, the sector-carrier sign, the sector resources situation, sector transmission power situation etc.), power control information (comprises the power control pattern, each power offset of channel etc.), access parameter information (comprises access period, access sequence, reverse traffic channel transmission initial packet form RDCHInitial Packet Format etc.) etc.Wherein, access parameter information is used to notify the relevant parameter of terminal needs when needs initiate to insert.
Fig. 1 shows to call out and connects the process of setting up.As shown in Figure 1, if certain terminal need be called or surf the Net, then the wireless access terminal sends access probe (Access Probe) to Radio Access Network on Reverse Access Channel, if Radio Access Network is agreed the wireless access terminal and is inserted, then sending this wireless access terminal of Access Grant message informing can insert, and be this terminal distribution reverse traffic channel sub-carrier resources, after terminal is received Access Grant message, beginning is carried out physical level coded modulation at reverse traffic channel according to the form that RDCH Initial PacketFormat stipulates, carrying ConnectionOpen Request message in the grouping bag, send to wireless access network then, after wireless access network is received Connection Open Request message, agreement connects, then at first assignment forward channel is replied Connection Open Response message then and is given terminal.Thereafter, wireless terminal then enters the activation of service attitude, waits for that wireless access network carries out preceding reverse traffic channel resource assignation, thus reverse data transmission before can carrying out.
Wherein, the structure of Access Grant message is as follows:
| AccessGrant | 0000 | 6+NMACID+ NRL_NODEID+ NFRID | MACID [NMACID] NodeID [NRL_NODEID] FrameResID [NFRID] TimingAdjust [6] |
The information of carrying comprises terminal iidentification (MAC ID), the reverse channel resources sign (Node ID) of distribution, other pattern assignation informations (Frame Res ID) and time adjustment information (Timing Adjust).
In 802.20 systems, reverse data uses OFDMA to carry out transfer of data, and reverse control channel information and Reverse Access Channel information all are to use a band frequency resource of reservation, adopt CDMA to carry out transfer of data.Access Probe (access probe) sends on Reverse Access Channel, and Reverse Access Channel need not distribute, and all AT can use.When sending Access Probe, terminal all is according to certain algorithm, chooses a Walsh sign indicating number and carries out spread spectrum.In 802.20 systems, adopt the Walsh space of 1024 dimensions, wherein Walsh index 0-17 is a reserved resource, 18-1023 uses when sending Probe for terminal.As shown in Figure 2, according to system configuration, whole Walsh space is divided into some groups.Can organize for the total 1-9 that terminal is used, every group span can equate, also can not wait.Purpose is to reduce different terminals to select identical Walsh index to cause the probability of collision, can pass through configuring negotiation.
As shown in Figure 3, the algorithm of terminal selection group is determined according to Pilot Level and Request Level promptly, select the Walsh index of which group by (Pilot Level, Request Level) unique definite terminal.Wherein, Pilot Level is the intensity of the forward direction bid of the AN that receives of terminal, Request Level reacted the buffer data of terminal own what.Terminal just can be selected any one the Walsh index in this group at random uniformly, and use the Walsh sign indicating number of this Walsh index correspondence to come spread spectrum AccessProbe, and send to AN after having determined group in this group.AN mates all Walsh index, up to correct resolution data, promptly can obtain the Walsh index, can know the buffer data situation and the situation of terminal thus.
Access Grant message sends on forward shared channel, and the resource that forward shared channel uses is stipulated that by system the AT that catches network can both obtain this regulation, thereby can receive the information of forward shared channel.
Connection Open Request message and Connection Open Response message are all sending (we set up process that request message sends to this connection the secondary access procedure on Traffic Channel) on the Traffic Channel, must be through the AN assigned resources, AT just knows the resource of use.Wherein the resource of Connection Open Request message use is exactly to be determined by the assignation information that carries in the Access Grant message.But the transformat that transmission Connection Open Request message is used on reverse traffic channel is stipulated by RDCH Initial Packet Format parameter.RDCH Initial Packet Format parameter is when the capture terminal network, obtains in the access parameter that transmits from the forward direction broadcast channel.At all terminals of current time, no matter the difference of the residing position of terminal, RDCHInitial Packet Format is to use identical value.Message format is as follows:
| Field | Length(bits) |
| AccessCycleDuration | 2 |
| AccessSequencePartition | 5 |
| MaxProbesPerSequence | 4 |
| ProbeRampUpStepSize | 4 |
| RDCHInitialPacketFormat | 6 |
| PilotThreshold1 | 3 |
| PilotThreshold2 | 3 |
| OpenLoopAdjust | 8 |
| NACMPClass values of the following field | |
| AccessRetryPersistance | 3 |
The difference that RDCH Initial Packet Format parameter is provided with is for the difference that influences of terminal call access.If it is bigger than normal that RDCH Initial Packet Format parameter is provided with, then for the user of cell boarder, wireless environment is too poor and can not support that the mistake frame increases, and causes to insert success rate and reduce; If it is less than normal that RDCH Initial Packet Format parameter is provided with, then for Cell Center User, the bag frequency efficiency of distribution is too low, if the long information of the certain bag of transmission, must distribute more sub-carrier resources, cause the whole system level of resources utilization lower, decreased performance.
Summary of the invention
Consider the problems referred to above and make the present invention, for this reason, the problem low at resource utilization ratio in the correlation technique and the call setup success rate is low, the invention provides a kind of selecting orthogonal code and use the call-establishing method of this method, it can improve resource utilization ratio and submit the call setup success rate simultaneously to.
According to an aspect of the present invention, provide a kind of selecting orthogonal code, may further comprise the steps:
Steps A 1 is divided into a plurality of son groups with each orthogonal code sets in the orthogonal code space, wherein, and the corresponding a kind of transformat of each son group; And step B, terminal is determined the transformat that it can be supported, determines in the orthogonal code sets one son group according to transformat then, and selects an orthogonal code at random from determined son group.Wherein, the selected orthogonal code of terminal is used for sending the access signal.
In addition, in step B, terminal is determined the transformat that it can be supported according to its residing wireless environment situation, and signal strength signal intensity that the residing wireless environment of terminal can receive by terminal forward and terminal self when sending probe the situation of transmitted power determine; In addition, in step B, the selected son group of terminal is corresponding to its transformat that can support.
Especially, between above-mentioned steps A 1 and step B, further may further comprise the steps: steps A 2, Access Network sends broadcast to terminal, wherein, contains the relevant parameter of son group in the broadcast.
Alternatively, steps A 2 can be following steps: steps A 2, predesignate the relevant parameter that son is organized in the agreement between Access Network and terminal.
The purpose of carrying out above-mentioned two kinds of different steps A 2 is to make terminal to know the grouping situation of Access Network side orthogonal code sets, thereby can be according in step B, coming true stator pack according to its transformat of supporting, and above-mentioned two kinds of different steps all can reach this purpose.
According to a further aspect in the invention, provide a kind of call-establishing method, it uses above-mentioned selecting orthogonal code, may further comprise the steps:
Steps A 1 is divided into a plurality of son groups with each orthogonal code sets in the orthogonal code space, wherein, and the corresponding a kind of transformat of each son group; Step B, terminal is determined the transformat that it can be supported, determines in the orthogonal code sets one son group according to transformat then, and selects an orthogonal code at random from determined son group;
Step D, terminal is used the orthogonal code of selecting at random to send and is inserted signal; Step D if Access Network allows terminal to insert, then sends to insert and permits message; Step e is permitted message in response to inserting, and terminal uses the transformat of determining in step B to send connection request message; And step F, in response to connection request message,, then send and insert response message if Access Network allows terminal to insert.
Especially, between above-mentioned steps A 1 and step B, further may further comprise the steps: steps A 2, Access Network sends broadcast to terminal, wherein, contains the relevant parameter of son group in the broadcast.
Alternatively, steps A 2 can be following steps: steps A 2, predesignate the relevant parameter that son is organized in the agreement between Access Network and terminal.
The purpose of carrying out above-mentioned two kinds of different steps A 2 is to make terminal to know the grouping situation of Access Network side orthogonal code sets, thereby can be according in step B, coming true stator pack according to its transformat of supporting, and above-mentioned two kinds of different steps all can reach this purpose.
In addition, Access Network can be known the transformat that terminal is adopted by resolve the orthogonal code that terminal is selected in step B in step e.
By above technical scheme, the present invention has realized following beneficial effect: improved resource utilization ratio, improved the call setup success rate simultaneously.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and exemplary embodiment of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the signalling diagram that call establishment is shown;
Fig. 2 is the schematic diagram that Walsh space in 802.20 systems is shown;
Fig. 3 illustrates the simplified diagram that terminal is selected the algorithm of Walsh code character;
Fig. 4 is the flow chart that illustrates according to the selecting orthogonal code of first embodiment of the invention; And
Fig. 5 is the flow chart that illustrates according to the call-establishing method of third embodiment of the invention.
Embodiment
Hereinafter with reference to accompanying drawing embodiments of the invention are described.
First embodiment
At first with reference to Fig. 4, Fig. 4 is the flow chart that illustrates according to the selecting orthogonal code of first embodiment of the invention.As shown in Figure 4, as follows according to the flow process of the selecting orthogonal code of first embodiment of the invention, wherein, orthogonal code is the Walsh sign indicating number:
In step S402, each the Walsh code character in the Walsh code space is divided into a plurality of son groups, wherein, the corresponding a kind of transformat of each son group; For example, Access Network can be divided into the 3rd group of Walsh sign indicating number 244-356 3 son groups, and is as shown in the table,
| PF0 | PF1 | PF2 |
| 244-281 | 282-319 | 320-356 |
| | Son group 1 | Son group 2 |
In step S404, Access Network sends broadcast to terminal, wherein, contains the relevant parameter of son group in the broadcast; For example, broadcast can be for as follows:
| Field | Length(bits) |
| AccessCycleDuration | 2 |
| AccessSequencePartition | 5 |
| MaxProbesPerSequence | 4 |
| ProbeRampUpStepSize | 4 |
| InitialPacketFormatLevel1 | 6 |
| InitialPacketFormatLevel2 | 6 |
| InitialPacketFormatLevel3 | 6 |
| PilotThreshold1 | 3 |
| PilotThreshold2 | 3 |
| OpenLoopAdjust | 8 |
| Nacmpclass value of the following field | |
| AccessRetryPersistance | 3 |
Wherein, InitialPacketFormatLevel1, InitialPacketFormatLevel2, InitialPacketFormatLevel3 are illustrated respectively in Walsh and organize under 3 sub situations about organizing that evenly are divided into, the pairing transformat of each son group, for example, son group 0 is corresponding to transformat InitialPacketFormatLevel1, son group 1 is corresponding to transformat InitialPacketFormatLevel2, and son group 2 is corresponding to transformat InitialPacketFormatLevel3.
Next, in step S406, terminal is determined the transformat that it can be supported according to its residing wireless environment, determine in the Walsh code character one son group according to transformat then, and from determined son group, select a Walsh sign indicating number at random, wherein, the selected Walsh sign indicating number of terminal is used for sending the access signal.
Second embodiment
Be with the different of first embodiment that according to a second embodiment of the present invention in step S404, Access Network need not to notify by broadcast the relevant parameter of null terminator Null group, but preestablish the relevant parameter of son group in the agreement between Access Network and terminal.In addition, second embodiment is identical with first embodiment, therefore, for unnecessary makes the present invention unclear, will omit being repeated in this description same section.
The 3rd embodiment
Describe the third embodiment of the present invention hereinafter with reference to Fig. 5, wherein, Fig. 5 is the flow chart that illustrates according to the call-establishing method of third embodiment of the invention.As shown in Figure 5, the flow process according to the call-establishing method of third embodiment of the invention is as follows:
In step S502, each the Walsh code character in the Walsh code space is divided into a plurality of son groups, wherein, the corresponding a kind of transformat of each son group; In step S504, Access Network sends broadcast to terminal, wherein, contains the relevant parameter of son group in the broadcast; In step S506, terminal is determined the transformat that it can be supported, determines in the Walsh code character one son group according to transformat then, and selects a Walsh sign indicating number at random from determined son group;
Next, in step S508, terminal is used the Walsh sign indicating number of selecting at random to send and is inserted signal; In step S510,, then send to insert and permit message if Access Network allows terminal to insert; Afterwards, in step S512, permit message in response to inserting, terminal uses the transformat of determining in step S506 to send connection request message; At last, in step S514,,, then send and insert response message if Access Network allows terminal to insert in response to connection request message.
The 4th embodiment
A fourth embodiment in accordance with the invention is that with the different of the 3rd embodiment in step S504, Access Network need not to notify by broadcast the relevant parameter of null terminator Null group, but preestablishes the relevant parameter of son group in the agreement between Access Network and terminal.In addition, the 4th embodiment is identical with the 3rd embodiment, therefore, for unnecessary makes the present invention unclear, will omit being repeated in this description same section.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a selecting orthogonal code is characterized in that, may further comprise the steps:
Steps A 1 is divided into a plurality of son groups with each orthogonal code sets in the orthogonal code space, wherein, and the corresponding a kind of transformat of each son group; And
Step B, terminal is determined the transformat that it can be supported, determines in the described orthogonal code sets one son group according to described transformat then, and selects an orthogonal code at random from determined son group.
2. selecting orthogonal code according to claim 1 is characterized in that, between described steps A 1 and step B, further may further comprise the steps:
Steps A 2, Access Network sends broadcast to terminal, contains the relevant parameter of described son group in the described broadcast.
3. selecting orthogonal code according to claim 1 is characterized in that, between described steps A 1 and step B, further may further comprise the steps:
Steps A 2 preestablishes the relevant parameter that described son is organized in the agreement between Access Network and described terminal.
4. according to each described selecting orthogonal code in the claim 1 to 3, it is characterized in that in described step B, described terminal is determined the described transformat that it can be supported according to its residing wireless environment situation.
5. according to each described selecting orthogonal code in the claim 1 to 3, it is characterized in that, in described step B, the described transformat that the selected son group of described terminal is supported corresponding to described terminal.
6. according to each described selecting orthogonal code in the claim 1 to 3, it is characterized in that in described step B, the described orthogonal code that described terminal is selected at random is used for sending the access signal.
7. a call-establishing method is characterized in that, uses according to each described selecting orthogonal code in the claim 1 to 6, may further comprise the steps:
Steps A 1 is divided into a plurality of son groups with each orthogonal code sets in the orthogonal code space, wherein, and the corresponding a kind of transformat of each son group;
Step B, terminal is determined the transformat that it can be supported, determines in the described orthogonal code sets one son group according to described transformat then, and selects an orthogonal code at random from determined son group;
Step C uses the described orthogonal code of selecting at random to send and inserts signal;
Step D if described Access Network allows described terminal to insert, then sends to insert and permits message;
Step e is permitted message in response to described access, and described terminal uses the described transformat of determining in described step B to send connection request message; And
Step F in response to described connection request message, if described Access Network allows described terminal to insert, then sends and inserts response message.
8. call-establishing method according to claim 7 is characterized in that, between described steps A 1 and step B, further may further comprise the steps:
Steps A 2, Access Network sends broadcast to terminal, contains the relevant parameter of described son group in the described broadcast.
9. call-establishing method according to claim 7 is characterized in that, between described steps A 1 and step B, further may further comprise the steps:
Steps A 2 is predesignated the relevant parameter that described son is organized in the agreement between Access Network and described terminal.
10. according to each described call-establishing method in the claim 7 to 9, it is characterized in that, described Access Network can be known the transformat that described terminal is adopted by resolve the described orthogonal code that described terminal is selected in described step B in described step e.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107079481A (en) * | 2014-08-29 | 2017-08-18 | 韦勒斯标准与技术协会公司 | Wireless communications method and wireless communication terminal |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107079481A (en) * | 2014-08-29 | 2017-08-18 | 韦勒斯标准与技术协会公司 | Wireless communications method and wireless communication terminal |
| CN107079481B (en) * | 2014-08-29 | 2020-12-22 | 韦勒斯标准与技术协会公司 | Wireless communication method and wireless communication terminal |
| US10917189B2 (en) | 2014-08-29 | 2021-02-09 | Wilus Institute Of Standards And Technology Inc. | Wireless communication method and wireless communication terminal |
| CN112714501A (en) * | 2014-08-29 | 2021-04-27 | 韦勒斯标准与技术协会公司 | Wireless communication method and wireless communication terminal |
| US11515957B2 (en) | 2014-08-29 | 2022-11-29 | Wilus Institute Of Standards And Technology Inc. | Wireless communication method and wireless communication terminal |
| US11515958B2 (en) | 2014-08-29 | 2022-11-29 | Wilus Institute Of Standards And Technology Inc. | Wireless communication method and wireless communication terminal |
| CN112714501B (en) * | 2014-08-29 | 2023-09-29 | 韦勒斯标准与技术协会公司 | Wireless communication method and wireless communication terminal |
| US11824630B2 (en) | 2014-08-29 | 2023-11-21 | Wilus Institute Of Standards And Technology Inc. | Wireless communication method and wireless communication terminal |
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