CN102916725A - Method, terminal and base station for transmitting special burst - Google Patents
Method, terminal and base station for transmitting special burst Download PDFInfo
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- CN102916725A CN102916725A CN2011102208405A CN201110220840A CN102916725A CN 102916725 A CN102916725 A CN 102916725A CN 2011102208405 A CN2011102208405 A CN 2011102208405A CN 201110220840 A CN201110220840 A CN 201110220840A CN 102916725 A CN102916725 A CN 102916725A
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Abstract
The invention provides a method, a terminal and a base station for transmitting special burst. The method includes that the terminal or the base station adopts the maximum spreading factor SF permitted by a system to transmit the SB (special burst). The method, the terminal and the base station have the advantages that the SB is transmitted by the maximum spreading factor SF, and a spreading gain is maximized, so that successful uplink and downlink SB detection rates are increased, and an effect of increasing the success rate of connection establishment, switching or reselection of services is achieved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of burst sending method, terminal and the base station of (Special Burst is called for short SB).
Background technology
Burst (SB) is at CDMA, especially in the TD-SCDMA mobile communication system, it is a kind of more special form, namely carry out the transmission of a special burst at physical resource, when being used under the connection mode transfer of data, data waiting for transmission are suspended, for example, use the PS business to carry out web page browsing, perhaps the speech interval of speech business is (according to statistics, in the voice call process, single-ended being in a minute only accounts for 3/8 of total time under the state, all the other all are the lonely phase), periodically carry out the filling of SB time slot, be used for carrying out control loop such as Frequency Synchronization, Timing Synchronization, gain synchronously, what power was synchronous keeps.As for the control loop under the connected state, and as follows with the relation of SB process:
In the mobile communication system, control loop mainly comprises automatic gain control (Automatic Gain Control, abbreviation AGC), automatic frequency calibration (Automatic Frequency Correction, abbreviation AFC), Timing Synchronization (Timing Control, abbreviation TC), these four elementary cycles of power control (Power Control is called for short PC).Under connection mode, when suspending appears in communication, there is not the up-downgoing transfer of data on the link, and link need to continue to keep, and control loop just can not be kept and be upgraded this moment, so at the communication interval, system and terminal are transmitted by periodic up-downgoing SB, are used for upgrading control loop.
In addition, the SB process also can be used in handoff procedure, after UE switches to Target cell, because specifically how the radio link quality of also not knowing Target cell, need to carry out SB and send or receiving course, come assessing link quality, carry out lock-out and judge, after only having synchronously upper Target cell, the business of up-downgoing just can continue.The main application scenarios of SB is as shown in table 1:
Table 1
Above-mentioned scene 1 to 4 all is applicable to SB of the present invention and optimizes.Scene 5 also can be used, but comparatively speaking, the receiver index word is larger, also can relate to the larger modification of agreement, can not support this scene, and scene 5 continues to use the SB process of rower.
The forming process of SB take TD-SCDMA as example, is generally carried out according to shown in Figure 1, as shown in Figure 1, the parameters such as code channel of channel training code (Midamble Code), system parameters Kcell, mode of operation, configuration are input to SB formation module, form the SB time slot, send.
Stipulate in the 3GPP agreement of TD-SCDMA and the rower that SB is that the physical resource in configuration sends, such as the single-code channel that has disposed SF=1 at the uplink service time slot, countless when sending the transmission of SB also be to send according to SF=1.And professional initial foundation, and even the switching of follow-up possible residential quarter or gravity treatment, just the RSCP measurement of residential quarter obtained information, radio link quality is not carried out deterministic finding out; And such as such as professional link setup or switching, only have up-downgoing to pass through the UE end sending and receiving of SB, NodeB end and UE hold detect SB after, just can enter synchronization, after this just enter in the business data transmission.
If link-quality is not very high, especially such as at the cell edge place that switches, if this moment NodeB or UE detect the success rate relative reduce of SB, the risk of the failure that will switch.Consider that again in the mobile communication system, ascending power limited is one of major constraints of covering of residential quarter, up SB was detected as power and just seemed even more important this moment.
No matter UE or NodeB, the probability of success of detection SB, directly related with signal to noise ratio (SNR), if the signal to noise ratio on the SB is higher, the success rate that should be able to correctly detect mutually SB is just larger.The below is take TD-SCDMA as example, illustrate again the data relationship that signal to noise ratio (SNR), signal interference ratio (SIR) and employing are estimated, as shown in Figure 2, two parts data after the employing demodulation are carried out the SNR estimation, and SIR estimates to adopt channel estimating to carry out.No matter business or the detection performance of SB directly are associated with SNR, improve SNR and just can improve demodulation quality and detection probability.
Detect the problem of the success rate relative reduce of SB for NodeB in the correlation technique or UE, not yet propose at present effective solution.
Summary of the invention
Main purpose of the present invention is to provide a kind of sending method, terminal and base station of burst, detects the problem of the success rate relative reduce of SB to solve at least above-mentioned NodeB or UE.
According to an aspect of the present invention, provide a kind of sending method of burst, having comprised: the maximum spreading factor SF that terminal or base station employing system allow sends SB.
Preferably, terminal or base station adopt maximum SF to send SB, comprising: the code channel of the maximum SF of system's permission is found out in terminal or base station from the physical resource of configuration by the code tree search.
Preferably, terminal or base station are searched for after the code channel of the maximum SF that finds out system's permission from the physical resource of configuration by code tree, and also comprise: terminal or base station adopt the code channel of maximum SF to send SB.
Preferably, terminal or base station adopt the code channel of maximum SF to send SB, comprising: terminal or base station adopt the predetermined code channel in the code channel of maximum SF to send SB.
Preferably, described terminal or base station adopt the predetermined code channel in the code channel of described maximum SF to send after the described SB, and also comprise: the base station of receiving terminal or terminal detect described SB at described predetermined code channel.
Preferably, predetermined code channel is the minimum number road in the code channel of maximum SF.
Preferably, system is the communication system of CDMA standard.
According to a further aspect in the invention, provide a kind of terminal, having comprised: the first sending module is used for the maximum spreading factor SF transmission burst SB that the employing system allows.
Preferably, the first sending module comprises: the first search submodule is used for searching for the code channel of finding out the maximum SF of system's permission from the physical resource of configuration by code tree.
Preferably, the first sending module also comprises: first sends submodule, is used for adopting the code channel of maximum SF to send SB.
According to another aspect of the invention, provide a kind of base station, having comprised: the second sending module is used for the maximum spreading factor SF transmission burst SB that the employing system allows.
Preferably, the second sending module comprises: the second search submodule is used for searching for the code channel of finding out the maximum SF of system's permission from the physical resource of configuration by code tree.
Preferably, the second sending module also comprises: second sends submodule, is used for adopting the code channel of maximum SF to send SB.
Preferably, the second transmission submodule also sends SB for the minimum number road of the code channel that adopts maximum SF.
By the present invention, adopt maximum spreading factor SF to send SB, so that the spreading gain maximization, thereby improve the successful verification and measurement ratio of up-downgoing SB, and then reached the effect of the success rate that improves professional link setup, switching or gravity treatment.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the SB formation schematic diagram according to correlation technique;
Fig. 2 is signal to noise ratio, the signal interference ratio according to correlation technique and adopts the data relationship schematic diagram of estimating;
Fig. 3 is the burst sending method flow chart according to the embodiment of the invention;
Fig. 4 is the tree schematic diagram according to the code channel of the embodiment of the invention;
Fig. 5 is the burst sending method flow chart according to the embodiment of the invention one;
Fig. 6 is the emulation schematic diagram according to the detected symbol signal to noise ratio snr of the embodiment of the invention one;
Fig. 7 is the emulation schematic diagram according to the detected symbol signal to noise ratio snr of the embodiment of the invention one;
Fig. 8 is the terminal structure schematic diagram according to the embodiment of the invention;
Fig. 9 is the architecture of base station schematic diagram according to the embodiment of the invention.
Embodiment
Hereinafter also describe in conjunction with the embodiments the present invention in detail with reference to accompanying drawing.Need to prove that in the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Fig. 3 is the burst sending method flow chart according to the embodiment of the invention, as shown in Figure 3, comprising:
Step S302 forms burst SB.
Step S304, the code channel of the maximum spread spectrum coefficient of system's permission is found out in terminal or base station by the code tree search in the physical resource of configuration;
Step S306 adopts the code channel of maximum spread spectrum coefficient to carry SB.
In the present embodiment, adopt maximum spreading factor SF to send SB, so that the spreading gain maximization, thereby improved the successful verification and measurement ratio of up-downgoing SB, and then reached the effect of the success rate that improves professional link setup, switching or gravity treatment.
SB sends with conventional professional physical slot by time does not have essential distinction, also be to modulate with spread spectrum to operate, difference is, conventional physical slot by time sends, original information bits need to be processed (with reference to the TS25.222 protocol description) through transmission channel, such as error correction coding, interweave, the links such as rate-matched, bit scramble, physical channel mapping, and the SB time slot sends, specific training bits directly carries out QPSK modulation and chip scrambling, sends behind the interpolation channel training code Midamble.At this moment reception and the detection of SB, gain only derives from the size of spreading gain, and the coding gain that no longer brings with error correction coding/decoding.
And according to agreement and national rower, the transmission of SB is that the physical resource in the physical channel configuration/reconfiguration carries out, professional such as up PS64k, physical resource is configured in the TS2 time slot, on second code channel of SF=2, so up SB also can only be on second code channel of this TS2 time slot, spreading factor (Spread Factor) SF=2, and this moment, spreading gain only had 10 * log (2)=3dB.For another example, descending PS128k is professional, and physical resource is configured in the TS5 time slot, and on first code channel of SF=1, so descending SB also can only be on first code channel of this TS5, SF=1, and this moment, 10 * log (1)=0dB did not have spreading gain this moment.
If the SB of up-downgoing does not detect successfully simultaneously, just can not enter the synchronous regime of up-downgoing, follow-up business just can not be proceeded down, thereby causes link setup, switching or gravity treatment failure, causes call drop.
In the present embodiment, no matter how many spread spectrum coefficient SF of physical resource configuration is, carry out without exception the up-downgoing transmission of SB according to spread spectrum coefficient maximization criterion, for the TD-SCDMA system, the SF that system allows is 16 to the maximum, and present embodiment sends according to the up-downgoing that SF=16 carries out SB.Certainly, the optimization method that provides of present embodiment is not limited to TD-SCDMA, so long as in the mobile communication system and standard of CDMA standard, can use.
Because the maximization spread spectrum coefficient maximizes spreading gain exactly, can maximum improve the successful detection probability of up-downgoing SB like this, thereby improve the probability of success of link setup or switching.
Next, further the code channel of the upper maximization of SB spread spectrum coefficient is selected to retrain: according to the physical resource configuration/reconfiguration, be starting point at this first-selection code channel, according to tree-shaped split graph, find out first maximum spread spectrum coefficient code channel, as the acquiescence code channel of SB transmission.Terminal or base station obtain the code channel of maximum SF automatically by the code tree search, like this, just need not Signalling exchange between terminal and base station.
Fig. 4 is the tree schematic diagram according to the code channel of the embodiment of the invention, as shown in Figure 4,
Expression, spread spectrum coefficient Q is i the code channel of j, and is in the TD-SCDMA system, up: spread spectrum coefficient j can get 1/2/4/8/16 these several values, and i can get from 1 to j value; Descending: j can get 1/16 these two values, and i can get from 1 to j value.
As can be seen from Figure 4, each code word spread spectrum coefficient expansion is twice, and can be split into two branches, and wherein a top branch repeats to obtain from the node code word, and a negative node code word is appended again from the node code word by a following branch, consists of the code word of double length.Such as
And
Wherein.By that analogy, all code words can uniquely be determined, and are as shown in table 2.
Table 2
Here we retrain yardage relation, just can save the Signalling exchange of wasting in order to notify concrete SB to use which code channel of SF=16 between NodeB and the UE, in existing protocol and rower, accomplish that minimum just the change can support.
Embodiment one
Fig. 5 is the burst sending method flow chart according to the embodiment of the invention one, as shown in Figure 5, may further comprise the steps:
The RSCP that step S502, UE report measures and the Serving cell quality satisfies certain condition, and system side is initiated switching command to UE, and the ascending physical signal resource after the configuration UE switching is second code channel of TS2 time slot, spreading factor SF=2
On.
Step S504, after switching instant point, UE is in the second number road of new residential quarter TS2, SF=2
The upper transmission SB that needs sets up uplink synchronous, and UE gives tacit consent to the 9th number road at new residential quarter TS2, SF=16 automatically
Upper transmission SB sets up uplink synchronous.
Step S504, the base station is in the 9th number road of SF=16
On carry out SB and detect.
The base station can be according to the second number road of radio-resource-configuration TS2, SF=2 when detecting up SB
Reckoning is obtained need to be in the 9th number road of SF=16
On carry out SB and detect, this process can retrain, to reduce the Signalling exchange between base station and the terminal.
In the present embodiment, SF=16 has the additional gain of 10 * log (16)-10 * log (2)=9dB than SF=2, supposes the carrier/interface ratio Ec/N0=10dB of link, namely signal interference ratio SIR.Fig. 6 and Fig. 7 are the emulation schematic diagrames according to the detected symbol signal to noise ratio snr of the embodiment of the invention one.Estimate from Fig. 6 and SIR shown in Figure 7, both roughly similar, be exactly near the 10dB that presets; SNR estimates that both approximately differ 22-13=9dB, meet expection.In addition, because the spreading gain during SF=16 is 12dB in the TD-SCDMA system, SNR estimates also just to add this spreading gain for SIR.Obviously, send up SB according to the code channel of SF=16 and send SB than the code channel at SF=2 higher spreading gain is arranged, improve the probability that NodeB correctly detects up SB.
Fig. 8 is the terminal structure schematic diagram according to the embodiment of the invention, and as shown in Figure 8, this terminal comprises: the first sending module 100 is used for the maximum spreading factor SF transmission SB that the employing system allows.
Wherein, the first sending module 100 comprises: the first search submodule 101 is used for searching for the code channel of finding out the maximum SF of system's permission from the physical resource of configuration by code tree; First sends submodule 102, is used for adopting the code channel of maximum SF to send SB.
Fig. 9 is the architecture of base station schematic diagram according to the embodiment of the invention, and as shown in Figure 9, this base station comprises: the second sending module 200 is used for the maximum spreading factor SF transmission SB that the employing system allows.
Wherein, the second sending module 200 comprises: the second search submodule 201 is used for searching for the code channel of finding out the maximum SF of system's permission from the physical resource of configuration by code tree; Second sends submodule 202, is used for adopting the code channel of maximum SF to send SB.
By the present invention, adopt maximum spreading factor SF to send SB, so that the spreading gain maximization, thereby improve the successful verification and measurement ratio of up-downgoing SB, and then reached the effect of the success rate that improves professional link setup, switching or gravity treatment.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
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 modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. the sending method of a burst SB is characterized in that, comprising:
The maximum spreading factor SF that terminal or base station employing system allow sends SB.
2. method according to claim 1 is characterized in that, terminal or base station adopt described maximum SF to send SB, comprising:
The code channel of the maximum SF of system's permission is found out in described terminal or base station from the physical resource of configuration by the code tree search.
3. method according to claim 1 is characterized in that, described terminal or base station are searched for after the code channel of the maximum SF that finds out system's permission from the physical resource of configuration by code tree, also comprise:
Described terminal or base station adopt the code channel of described maximum SF to send described SB.
4. method according to claim 3 is characterized in that, described terminal or base station adopt the code channel of described maximum SF to send described SB, comprising:
Described terminal or base station adopt the predetermined code channel in the code channel of described maximum SF to send described SB.
5. method according to claim 4 is characterized in that, described terminal or base station adopt the predetermined code channel in the code channel of described maximum SF to send after the described SB, also comprise:
The base station of receiving terminal or terminal detect described SB at described predetermined code channel.
6. method according to claim 5 is characterized in that, the minimum number road in the code channel that described predetermined code channel is described maximum SF.
7. according to claim 1 to 6 each described methods, it is characterized in that described system is the communication system of CDMA standard.
8. a terminal is characterized in that, comprising:
The first sending module is used for the maximum spreading factor SF transmission SB that the employing system allows.
9. terminal according to claim 8 is characterized in that, described the first sending module comprises:
The first search submodule is used for searching for the code channel of finding out the maximum SF of system's permission from the physical resource of configuration by code tree.
10. terminal according to claim 9 is characterized in that, described the first sending module also comprises:
First sends submodule, is used for adopting the code channel of described maximum SF to send described SB.
11. a base station is characterized in that, comprising:
The second sending module is used for the maximum spreading factor SF transmission SB that the employing system allows.
12. base station according to claim 11 is characterized in that, described the second sending module comprises:
The second search submodule is used for searching for the code channel of finding out the maximum SF of system's permission from the physical resource of configuration by code tree.
13. base station according to claim 12 is characterized in that, described the second sending module also comprises:
Second sends submodule, is used for adopting the code channel of described maximum SF to send described SB.
14. base station according to claim 13 is characterized in that, described second sends submodule also sends described SB for the minimum number road of the code channel that adopts described maximum SF.
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| CN101399597A (en) * | 2007-09-27 | 2009-04-01 | 鼎桥通信技术有限公司 | Method and device for sending special burst frame |
| CN101925182A (en) * | 2009-06-15 | 2010-12-22 | 大唐移动通信设备有限公司 | Resource management method, system and equipment |
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| US20060056404A1 (en) * | 2004-09-14 | 2006-03-16 | Lucent Technologies, Inc. | Method and apparatus for wireless communication using voice over internet protocol |
| CN1805320A (en) * | 2006-01-16 | 2006-07-19 | 中兴通讯股份有限公司 | Method for code channel allocation in TD-SCDMA access system |
| CN101277522A (en) * | 2007-03-29 | 2008-10-01 | 中兴通讯股份有限公司 | Method and apparatus for adjudging code path resource in WCDMA system |
| CN101399597A (en) * | 2007-09-27 | 2009-04-01 | 鼎桥通信技术有限公司 | Method and device for sending special burst frame |
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Application publication date: 20130206 |