CN100455113C - Up-link access method for user terminal - Google Patents
Up-link access method for user terminal Download PDFInfo
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- CN100455113C CN100455113C CNB2005100928124A CN200510092812A CN100455113C CN 100455113 C CN100455113 C CN 100455113C CN B2005100928124 A CNB2005100928124 A CN B2005100928124A CN 200510092812 A CN200510092812 A CN 200510092812A CN 100455113 C CN100455113 C CN 100455113C
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- user terminal
- transmission bandwidth
- bandwidth
- wireless system
- certain ratio
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The method is used in a radio system and comprises: a) detecting the transmitting power of user to decide if it is over the threshold of transmitting power; if yes, then calculating the current W/C value; otherwise, ending the process; wherein, W is the transmission bandwidth, and C is the channel speed rate; b) deciding if the calculated W/C value is less than a preset first ratio value in order to decide if the radio system has the idle bandwidth; if yes, then increasing transmission bandwidth allocated to the user; otherwise, ending the process; c)user end makes uplink access by using the increased bandwidth.
Description
Technical field
The present invention relates to the wireless access technology field, be meant a kind of up-link access method for user terminal especially.
Background technology
In the present communication system, wireless system (as base station and base station controller) is when distributing ascending wireless resource to realize the up access of user terminal for user terminal, comprise following two kinds of methods: a kind of is according to the data rate of customer service and the modulation coding mode of business datum, for the ascending wireless resource that the user calculates and distribution is fixing, as bandwidth (bandwidth can be represented with time slot, frequency or extended code mode).Another kind is that system is that the user distributes fixing ascending wireless resource, but the modulation coding mode in the time of can sending data according to user's channel quality adjustment user in the communication process, thereby change the data rate of customer service, this mode is also referred to as link adaptation techniques.
In the method for salary distribution of above-mentioned two kinds of ascending wireless resources, common characteristic is that wireless system is that the up-link wireless bandwidth resources that the user distributes are fixed.Under the fixed allocation mode of this wireless bandwidth resource, the loading condition of system is not considered in the distribution of resource, this just means, when the load of wireless system is not full load (accounting for the part of wireless bandwidth resource as the bandwidth resources of terminal use), caused efficient resource by vacant and form waste, and, cause the bigger transmitting power of user terminal needs to realize up access, thereby it is bigger to cause user terminal to expend electricity ratio.
For example, if wireless system has the Radio Resource of 5MHz bandwidth to distribute, and during according to the customer service only 2M bandwidth that has been the user terminal fixed allocation, then cause the vacant of 3M bandwidth resources and waste.And, though this moment, wireless system had the 5MHz bandwidth resources, but this moment, user terminal only used the 2M bandwidth but not 5MHz bandwidth when coming up transmit traffic data, comparatively speaking user terminal have to one than higher transmitting power, could satisfy the rate requirement of business.Because transmitting power is higher, so inevitable terminals consume electric weight is bigger.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of up-link access method for user terminal, with reach the user terminal power saving with the purpose that prolongs call duration time.
Up-link access method for user terminal provided by the invention is used for wireless system, may further comprise the steps:
Whether A, the transmitting power that detects user terminal surpass the transmitting power threshold value of setting, if then calculate the ratio W/C of current W and C; Otherwise finish; Wherein, W is current transmission bandwidth, and C is current channel speed;
B, whether judge the W/C calculate, and judge whether wireless system has idle transmission bandwidth less than first certain ratio of setting, as if all being, the transmission bandwidth and the informing user terminal that then increase described user terminal and distributed; Otherwise finish;
C, user terminal adopt the transmission bandwidth after increasing to carry out up access.
Wherein, the described transmission bandwidth of steps A obtains from wireless system.
Wherein, when user service data was launched continuously, described channel speed C was identical with described traffic data rate for steps A.During the discontinuous emission of user service data, the described channel speed C of steps A is the momentary rate of described business datum when sending.
Optionally, the transmission bandwidth of the described user terminal distribution of the described increase of step B will make W/C greater than second certain ratio of setting.Described second certain ratio is greater than described first certain ratio of step B.
Wherein, the step of the described up access of step C comprises: adopt the modulation coding mode of the bandwidth correspondence after increasing newly to handle the data that will send.
Preferable, described first certain ratio is 1.0.
By said method as can be seen, the ascending resource method of salary distribution provided by the invention, when user's terminal transmitting power reaches certain thresholding, and wireless system also has the idle bandwidth resource can divide timing, mode according to the present invention realizes up access for the user distributes the more bandwidth resource, thereby comes the limited subscriber terminal transmit power below the specific value, to be in low power transmissions state to keep terminal at certain, reach purpose of power saving, to prolong the call duration time of user terminal.The bandwidth resources of the wireless system that has also utilized are fully on the other hand avoided the vacant of bandwidth resources and the waste that causes.
Description of drawings
Fig. 1 is under the Shannon theory
Change curve for α.
Fig. 2 is the up access process figure of user terminal.
Embodiment
At first analyze Shannon theory, the channel capacity formula under the white Gaussian noise channel is:
Wherein, C is expressed as channel speed, is also referred to as channel capacity, and W is a transmission bandwidth, and P is received power (power when received power refers to user's terminal transmitting power through wireless channel decay back arrival wireless system), and ρ is the power spectral density of white noise.
(a) carries out fortran with formula, derives received power P and can be expressed as:
P＝(2
C/W-1)*ρ*W，......(b)
Wherein, definition α=W/C, the ratio of expression transmission bandwidth and channel speed, then can derive by formula (b):
P＝{(2
C/W-1)*W/C}*ρ*C＝{(2
1/α-1)*α}*ρ*C，......(c)
If definition λ=(2
1/ α-1) * α ... (d)
Then can derive: P=λ * ρ * C...... (e) by formula (c), (d)
According to formula (d), can depict shown in Fig. 1
Change curve for α.Can analyze by Fig. 1, along with the increase of α,
Reduce, because α represents the ratio of transmission bandwidth W and channel speed C, and formula (e) shows
Be directly proportional with P, therefore, Fig. 1 just means that also when W/C increased, needed received power P was just more little.
Referring to the flow chart of the up access of user terminal of the present invention shown in Fig. 2, the present invention is described in detail, may further comprise the steps:
Step 201: the thresholding that a transmitting power is set for user terminal.
Step 202: user terminal detects its current transmit power and whether surpasses this transmitting power thresholding, if, expression user's terminal transmitting power this moment is higher, power consumption is big (for example, when user terminal is distant apart from the base station, or signal receives when unintelligible), then execution in step 203, if not, expression this moment, user terminal power consumption was in allowed band, then process ends.
Be understood that user terminal also can send to wireless system with detected transmission power level, judge by wireless system whether the transmitting power of user terminal surpasses the threshold value of setting.
Step 203: the value that is calculated as the current W/C of this user terminal distribution.
Wherein, transmission bandwidth W is distributed by wireless system, so can be obtained by wireless system.Channel speed C is relevant with the presently used business of user.Different business can dispose different channel speed C, for example the AMR speech business has 4.75Kbps to 8 service rate grades such as 11.2kbps, if business datum is launched continuously, then the value of channel speed C is identical with traffic data rate, can obtain channel speed C according to the speed of business configuration.And for the business datum of discontinuous emission, for example for time-division system, perhaps for data service or VoIP business, the value of channel speed C is the momentary rate of business datum delivery time.
Step 204: judge that the W/C value calculate is whether less than the numerical value of a setting, the numerical value that claims this setting herein is a α value (or claiming first certain ratio), and wireless system is judged the current idle bandwidth resources that whether have, if all be, then execution in step 205, if do not meet, then finish by any condition.
Wherein, as Fig. 1, after the W/C value was greater than 1.0, it is slower that λ changes, and be a constant substantially, and W/C is less than 1.0 o'clock, and the λ change curve is steeper, be worth bigger, so the value of W/C can get 1.0.
Step 205: wireless system distributes newly-increased bandwidth resources and informing user terminal for this user terminal, user terminal increases this part bandwidth resources, and according to the variation of bandwidth, the corresponding modulation coding mode that sends in the data procedures that changes carries out up access.
Wherein, the bandwidth resources of distribution will make W/C greater than the numerical value of a setting, and the numerical value that claims this setting herein is the 2nd α value (or claiming second certain ratio).For fear of ping-pong, can make the 2nd α value greater than the α value described in the step 204.
About above-mentioned amount of bandwidth and corresponding modulation coding mode, be not emphasis of the present invention, and, repeat no more herein owing to can adopt the corresponding relation of known bandwidth and modulation coding mode.
From top embodiment as can be seen, the present invention has at wireless system under the situation of assignable idle bandwidth resource, and the transmitting power that can control user terminal maintains certain below the value, thereby reaches purpose of power saving.On the other hand, the assignable bandwidth of use wireless system as much as possible is avoided the waste of bandwidth resources.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, a kind of up-link access method for user terminal is used for wireless system, it is characterized in that, may further comprise the steps:
Whether A, the transmitting power that detects user terminal surpass the transmitting power threshold value of setting, if then calculate the ratio W/C of current W and C; Otherwise finish;
Wherein, W is current transmission bandwidth, and C is current channel speed;
B, whether judge the W/C calculate, and judge whether wireless system has idle transmission bandwidth less than first certain ratio of setting, as if all being, the transmission bandwidth and the informing user terminal that then increase described user terminal and distributed; Otherwise finish;
C, user terminal adopt the transmission bandwidth after increasing to carry out up access.
2, method according to claim 1 is characterized in that, the described transmission bandwidth of steps A obtains from wireless system.
3, method according to claim 1 is characterized in that, when user service data was launched continuously, described channel speed C was identical with described traffic data rate for steps A.
4, method according to claim 1 is characterized in that, during the discontinuous emission of user service data, the described channel speed C of steps A is the momentary rate of described business datum when sending.
5, method according to claim 1 is characterized in that, the transmission bandwidth that the described user terminal of the described increase of step B distributes will make W/C greater than second certain ratio of setting.
6, method according to claim 5 is characterized in that, described second certain ratio is greater than described first certain ratio of step B.
7, method according to claim 1 is characterized in that, the step of the described up access of step C comprises: adopt the modulation coding mode of the bandwidth correspondence after increasing newly to handle the data that will send.
8, method according to claim 1 is characterized in that, described first certain ratio is 1.0.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100928124A CN100455113C (en) | 2005-08-18 | 2005-08-18 | Up-link access method for user terminal |
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| CNB2005100928124A CN100455113C (en) | 2005-08-18 | 2005-08-18 | Up-link access method for user terminal |
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| CN1917699A CN1917699A (en) | 2007-02-21 |
| CN100455113C true CN100455113C (en) | 2009-01-21 |
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| CNB2005100928124A Expired - Fee Related CN100455113C (en) | 2005-08-18 | 2005-08-18 | Up-link access method for user terminal |
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| CN101296474B (en) * | 2007-04-26 | 2013-01-02 | 华为技术有限公司 | Method and device for distributing transmission resource for mobile station |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1185702A (en) * | 1996-05-06 | 1998-06-24 | 摩托罗拉公司 | Time-division-locking indicating order circuit of power control and business channel decoding and method thereof |
| US5982813A (en) * | 1996-09-30 | 1999-11-09 | Amsc Subsidiary Corporation | Demand-based power and data rate adjustments to a transmitter to optimize channel capacity and power usage with respect to data transmission traffic over a fixed-bandwidth channel |
| WO2002100025A1 (en) * | 2001-06-07 | 2002-12-12 | Telefonaktiebolaget Lm Ericsson (Publ) | System and method for link adaptation in communication systems |
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2005
- 2005-08-18 CN CNB2005100928124A patent/CN100455113C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1185702A (en) * | 1996-05-06 | 1998-06-24 | 摩托罗拉公司 | Time-division-locking indicating order circuit of power control and business channel decoding and method thereof |
| US5982813A (en) * | 1996-09-30 | 1999-11-09 | Amsc Subsidiary Corporation | Demand-based power and data rate adjustments to a transmitter to optimize channel capacity and power usage with respect to data transmission traffic over a fixed-bandwidth channel |
| WO2002100025A1 (en) * | 2001-06-07 | 2002-12-12 | Telefonaktiebolaget Lm Ericsson (Publ) | System and method for link adaptation in communication systems |
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