CN101180811A - Method for up-link transmit power management in a wireless broadband terminal - Google Patents
Method for up-link transmit power management in a wireless broadband terminal Download PDFInfo
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- CN101180811A CN101180811A CNA2006800179960A CN200680017996A CN101180811A CN 101180811 A CN101180811 A CN 101180811A CN A2006800179960 A CNA2006800179960 A CN A2006800179960A CN 200680017996 A CN200680017996 A CN 200680017996A CN 101180811 A CN101180811 A CN 101180811A
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Abstract
A method is disclosed for optimizing up-link transmit powers of a wireless broadband terminal operating in a predetermined frequency band in a multi-carrier system, the method comprising assigning a transmit signal to one or more sub-carriers of predetermined frequencies, and capping the output powers of the transmit signal to a predetermined level based on the predetermined frequencies, wherein the output power of the transmit signal is lower if frequencies of the transmit signal have less guard band to the edge of the predetermined frequency band.
Description
Technical field
Relate generally to wireless communication system of the present invention more particularly, relates to the power management that is used for the multi-carrier-wave wireless wide-band terminal.
Background technology
In multi-carrier wireless communications system, send signal (transmit signal) and have a plurality of subcarriers (sub-carrier) or tone.Each subcarrier or tone carry the information of scheduled volume in predefined bandwidth.For example, in some multicarrier system, form by ten 500kHz subcarriers that form the 5MHz bandwidth signals from the downlink transmitted signal of base station (BTS) transmitter.
In licensed band (licensed band) such as MMDS frequency band (2500-2686MHz) and WCS frequency band (2305-2360MHz), in order to minimize of the interference of a frequency band, the amount of federal emission regulation (Federal emission rules) restriction (out-of-band) spuious (spurious) transmitting power outside the band that transmitter sends to another.As a result, but the transmitter power output is limited in guaranteeing observing the maximum enable level that this restriction is stipulated.
Near the outer emission of the band band edge is caused by the intermodulation distortion (intermodulationdistortion) of transmitter usually.Usually cause by the intrinsic noise level (noise floor) of transmitter or the intermodulation distortion of transmitter and the combination of intrinsic noise level away from the outer emission of the band of band edge.
Intermodulation distortion is a nonlinear distortion, is characterized in occurring in the output signal of equipment the frequency as the linear combination of the fundamental frequency that exists in the input signal and all harmonic waves (harmonic).
In order to satisfy the FCC standard, the equipment supplier implements multiple technologies usually as required, is summarized as follows.
First kind of linear amplifier of high power that technology is the distortion of minimum intermodulation system.Its advantage is higher transmitted power, better system link budget.But the linear amplifier of high power has the shortcoming such as expensive, high power consumption and large scale (heat sink reason).Therefore, the linear amplifier of high power is suitable for BTS equipment, and is not suitable for having a preference for client device (Customer-premises-equipment, CPE) terminal of reduced size and lower cost.
Second kind of technology is filtering intermodulation distortion and the channel model that reduces the outer intrinsic noise level of band.Its advantage is to reduce the outer spurious emissions of band.But it is expensive that the filter that its shortcoming is to increase causes, the low transmitted power that filter loss causes, near the outer spurious emissions of the band fixing frequency channels and the unable minimizing band edge.Therefore, channel model is suitable for BTS equipment and the CPE terminal of the ability that is not suitable for requiring communicating by letter with different B TS by the different frequency channel equally.
The third technology is to provide extra protection frequency band to band edge, and it allows higher transmit power under the prerequisite that does not realize expensive linear amplifier.But its shortcoming is the poor efficiency utilization of frequency spectrum, the capacity and the higher system total cost of reduction.
Therefore, wish improving one's methods in a kind of WiMAX CPE terminal that is used in such as pcmcia card of design, when satisfying government's emission regulation, still can keep low cost, low-power consumption and reasonable size.
Summary of the invention
Consider above problem; a kind of method of up-link transmit power of the wireless broadband terminal that is used for optimizing the predetermined frequency band that is operated in multicarrier system is disclosed; described method comprises and will send the one or more subcarriers of signal allocation to preset frequency; and the power output that will send signal is limited in below the predetermined level based on preset frequency; wherein if the frequency that sends signal has less protection frequency band for the edge of predetermined frequency band, the power output that then sends signal is lower.
Yet structure of the present invention and method of operation and other target thereof and advantage will get the best understanding during to the description of specific embodiment below reading together with accompanying drawing.
Description of drawings
Fig. 1 illustrates 10 carrier wave base station signals;
Fig. 2 illustrates client device (CPE) signal of 1 carrier wave, 2 carrier waves or 4 carrier waves;
Fig. 3 A illustrates client device (CPE) terminal signaling that sends at band edge according to one embodiment of present invention;
Fig. 3 B illustrates according to one embodiment of present invention at client device (CPE) terminal signaling that sends away from band edge;
Fig. 4 illustrates power output that client device (CPE) according to another embodiment of the invention can work distribute (output power profile).
Embodiment
Present disclosure provides a kind of method that is used for the power management in wireless broadband client equipment (CPE) terminal of the multicarrier system that licensed band is worked, with improvement capacity and link budget.
Fig. 1 illustrates 10 carrier wave base station signals.The bandwidth that is used for a subcarrier is 500kHz, so the bandwidth of 10 subcarrier formation 5MHz.Each subcarrier is used for carrying the information of scheduled volume.
Fig. 2 illustrates client device (CPE) signal of the sub carrier groups of using 1 carrier wave, 2 carrier waves or 4 carrier waves.Because the bandwidth of each subcarrier also is 500kHz, therefore the total bandwidth of using is based on the number of the subcarrier that is comprised.For example, under 2 carrier case, the CPE signal has the 1MHz bandwidth.When the uplink bandwidth increase in demand, the CPE terminal can be readjusted 4 carrier signals of occupying the 2MHz bandwidth.
The wireless broadband system that works in certain licensed band must send all signals in this frequency band.The protection frequency band be for prevent two between the radio bands interference and sub-fraction radio-frequency spectrum between radio bands.If the CPE terminal works is near band edge, then owing to lack enough protection frequency bands, so the difficult requirement of satisfying the outer spurious emissions of band of terminal.This need reduce transmitted power.On the other hand, if terminal works is in from band edge at a distance, then owing to increased the protection bandwidth, so terminal is easier to satisfy the requirement of the outer spurious emissions of band.
So along with the increase of terminal uplink bandwidth demand, BTS can arrive the wireless flow task transfers from the farther carrier wave of band edge, in this way, terminal needn't reduce its transmitted power.Transfer away from band edge both can be finished by the frequency of mobile baseband signal, also can finish by readjusting the RF carrier frequency.
Fig. 3 A illustrates the CPE terminal signaling that sends at band edge 310 according to one embodiment of present invention.Lift a concrete example, suppose that frequency band 300 is WCS frequency band (2305-2360 MHz), and signal is 4 carrier signals.Owing to lack the protection frequency band, therefore in order to satisfy the emission regulation, the transmitted power 320 of signal is limited in+below the 24dBm.
Fig. 3 B illustrates 4 same carrier wave CPE signals for example sending away from band edge 310 1MHz places, so the upper limit of transmitted power 420 can be elevated to+28dBm.Because the 1MHz that increases protection frequency band 315, so the emission regulation is still satisfied in the increase of transmitted power.
Similarly, in MMDS frequency band (2500-2686MHz), the CPE terminal can the band edge (0.25MHz protects frequency band) of 5.5MHz channel locate to send 4 carrier waves+the 27dBm signal, this satisfies the outer spurious emissions requirement of federal band.But, having had from band edge 1MHz or more Additional Protection frequency band, the CPE terminal can send 4 same carrier signals, still satisfy the outer spurious emissions requirement of federal band simultaneously with+30dBm.
Fig. 4 illustrates the power output that CPE terminal according to another embodiment of the invention can work and distributes 410.Power output distributes and 410 to send to CPE terminal based on the frequency band or the channel 400 of CPE terminal works by the base station by the system manager.How distribute power 410 indication is comprising on the predetermined frequency band of all subcarriers managing power.Frequency spectrum 402 is not had by the system manager, so the distribution of the power output in the frequency spectrum 404 410 is reduced.On the other hand, frequency spectrum 408 is had by same system manager, so in the frequency spectrum 406 that upwards approaches frequency spectrum 408, power output distributes unrestricted.Therefore by provide power output to distribute for CPE, the power output spectral density of terminal is controlled, and the outer spurious emissions of band is controlled.
In multicarrier system, the CPE terminal is designed to have the ability at one, two or four subcarrier of any subcarrier frequency place emission that distributes.The CPE terminal also is designed to have the power control range more than 60dB by the 1dB step sizes.By forward direction and reverse power control, base station (BTS) has the ability that detects the approximate distance between CPE terminal and the BTS.
The ability that the sense terminals distance has been arranged, BTS can manage its up-link transmit power with the cooperation of CPE terminal.If the CPE terminal is near BTS, mean that the CPE terminal does not need to send total power and communicates by letter with BTS, then system near can the allocated frequency band edge subcarrier and the CPE transmitted power is limited in lower maximum can allows under the power level, for example, for the CPE terminal that works in the WCS frequency band be+24dBm, and be+27dBm for the CPE terminal that works in the MMDS frequency band.
For CPE terminal away from BTS, mean that the CPE terminal may need to send total power and communicate by letter with BTS, system can distribute from band edge 1MHz or farther subcarrier and the CPE transmitted power is limited in higher maximum and can allow under the power level, for example, CPE terminal for the WCS frequency band is+28dBm, and for MMDS CPE terminal is+30dBm.
For away from terminal, system can also distribute the modulation with low signal peak-to-average force ratio (peak-to-mean).Different modulation has different signal peak-to-average ratio.The signal of low peak average ratio will keep less driving output power amplifier in identical at average output power.The output power amplifier of less driving will generate less band and launch outward.So by lower peak-to-average force ratio, average transmitting power can highlyer satisfy away from the transmission requirement of terminal.
By these methods, under the prerequisite that does not increase the cost that is used for bigger linear power amplifier, managed the up-link power of wireless bandwidth terminal.Overall system capacity and link budget also are improved.
Though illustrate and described illustrative embodiment of the present invention, can expect other modifications, change and substitute.Therefore, as proposing in the following claim, claims should extensively be understood in the mode consistent with the scope of present disclosure.
The cross reference of related application
The application requires to submit on May 23rd, 2005 is entitled as the rights and interests that " Method for Optimizing Up-link Transmit Power for a Wireless Broadband Terminal in a Multi-CarrierSystem that Operating in the License Bands to Improve Capacity and LinkBudget ", sequence number are 60/684,021 U.S. Provisional Patent Application and the U.S. Patent application that is entitled as " Method for Up-Link Transmit Power Management in aWireless Broadband Terminal " submitted on May 16th, 2006.
Claims (26)
1. method that is used for management work in the transmitted power of the wireless broadband terminal of the predetermined frequency band of multicarrier system, described method comprises:
To send signal allocation to one or more subcarriers; And
With the Power Limitation of described transmission signal at predetermined level based on the proximity between described subcarrier and the described predetermined frequency band edge,
Wherein if the described transmission signal on the predetermined subcarrier has less protection frequency band for the edge of described predetermined frequency band, the power of the transmission signal on the then described predetermined subcarrier is lower.
2. the method for claim 1, comprise also by base station transceiver described transmission signal is re-assigned to second group of subcarrier from first group of subcarrier that described second group of subcarrier has than described first group of subcarrier from the farther frequency in the edge of described predetermined frequency band.
3. the method for claim 1, comprise also by described terminal described transmission signal is re-assigned to second group of subcarrier from first group of subcarrier that described second group of subcarrier has than described first group of subcarrier from the farther frequency in the edge of described predetermined frequency band.
4. the method for claim 1, also be included in the signal peak-to-average ratio that has less than the described transmission signal of modulation on first group of subcarrier of the signal peak-to-average ratio of second group of subcarrier, described first group of subcarrier is nearer from the edge of described predetermined frequency band than described second group of subcarrier.
5. the method for claim 1, wherein said restriction also comprise the restriction that distributes based on predetermined power.
6. method as claimed in claim 5, wherein for one or more subcarriers near the edge of the frequency band adjacent with another frequency band that is not used by described multicarrier system, described distribute power with Power Limitation at lower level.
7. method that is used for management work in the transmitted power of the wireless broadband terminal of the predetermined frequency band of multicarrier system, described method comprises:
To send signal allocation to one or more subcarriers;
By base station transceiver described transmission signal is re-assigned to second group of subcarrier from first group of subcarrier, described second group of subcarrier has than described first group of subcarrier from the farther frequency in the edge of described predetermined frequency band; And
With the Power Limitation of described transmission signal at predetermined level based on the proximity between described subcarrier and the described predetermined frequency band edge,
Wherein if the described transmission signal on the predetermined subcarrier has less protection frequency band for the edge of described predetermined frequency band, the power of the transmission signal on the then described predetermined subcarrier is lower.
8. method as claimed in claim 7, also be included in the signal peak-to-average ratio that has less than the described transmission signal of modulation on first group of subcarrier of the signal peak-to-average ratio of second group of subcarrier, described first group of subcarrier is nearer from the edge of described predetermined frequency band than described second group of subcarrier.
9. method as claimed in claim 7, wherein said restriction also comprise the restriction that distributes based on predetermined power.
10. method as claimed in claim 9, wherein for one or more subcarriers near the edge of the frequency band adjacent with another frequency band that is not used by described multicarrier system, described distribute power with Power Limitation at lower level.
11. a method that is used for management work in the transmitted power of the wireless broadband terminal of the predetermined frequency band of multicarrier system, described method comprises:
To send signal allocation to one or more subcarriers;
By described terminal described transmission signal is re-assigned to second group of subcarrier from first group of subcarrier, described second group of subcarrier has than described first group of subcarrier from the farther frequency in the edge of described predetermined frequency band; And
With the Power Limitation of described transmission signal at predetermined level based on the proximity between described subcarrier and the described predetermined frequency band edge,
Wherein if the described transmission signal on the predetermined subcarrier has less protection frequency band for the edge of described predetermined frequency band, the power of the transmission signal on the then described predetermined subcarrier is lower.
12. method as claimed in claim 11, also be included in the signal peak-to-average ratio that has less than the described transmission signal of modulation on first group of subcarrier of the signal peak-to-average ratio of second group of subcarrier, described first group of subcarrier is nearer from the edge of described predetermined frequency band than described second group of subcarrier.
13. method as claimed in claim 11, wherein said restriction also comprise the restriction that distributes based on predetermined power.
14. method as claimed in claim 13, wherein for one or more subcarriers near the edge of the frequency band adjacent with another frequency band that is not used by described multicarrier system, described distribute power with Power Limitation at lower level.
15. a method that is used for management work in the transmitted power of the wireless broadband terminal of the predetermined frequency band of multicarrier system, described method comprises:
To send signal allocation to one or more subcarriers;
The signal peak-to-average ratio that has less than first group of subcarrier of the signal peak-to-average ratio of second group of subcarrier on the modulation described transmission signal, described first group of subcarrier is nearer from the edge of described predetermined frequency band than described second group of subcarrier; And
With the Power Limitation of described transmission signal at predetermined level based on the proximity between described subcarrier and the described predetermined frequency band edge,
Wherein if the described transmission signal on the predetermined subcarrier has less protection frequency band for the edge of described predetermined frequency band, the power of the transmission signal on the then described predetermined subcarrier is lower.
16. method as claimed in claim 15, comprise also by base station transceiver described transmission signal is re-assigned to second group of subcarrier from first group of subcarrier that described second group of subcarrier has than described first group of subcarrier from the farther frequency in the edge of described predetermined frequency band.
17. method as claimed in claim 15, comprise also by described terminal described transmission signal is re-assigned to second group of subcarrier from first group of subcarrier that described second group of subcarrier has than described first group of subcarrier from the farther frequency in the edge of described predetermined frequency band.
18. method as claimed in claim 15, wherein said restriction also comprise the restriction that distributes based on predetermined power.
19. method as claimed in claim 18, wherein for one or more subcarriers near the edge of the frequency band adjacent with another frequency band that is not used by described multicarrier system, described distribute power with Power Limitation at lower level.
20. a method that is used for management work in the transmitted power of the wireless broadband terminal of the predetermined frequency band of multicarrier system, described method comprises:
To send signal allocation to one or more subcarriers;
By base station transceiver described transmission signal is re-assigned to second group of subcarrier from first group of subcarrier, described second group of subcarrier has than described first group of subcarrier from the farther frequency in the edge of described predetermined frequency band;
The signal peak-to-average ratio that has less than first group of subcarrier of the signal peak-to-average ratio of second group of subcarrier on the modulation described transmission signal, described first group of subcarrier is nearer from the edge of described predetermined frequency band than described second group of subcarrier; And
With the Power Limitation of described transmission signal at predetermined level based on the proximity between described subcarrier and the described predetermined frequency band edge,
Wherein if the described transmission signal on the predetermined subcarrier has less protection frequency band for the edge of described predetermined frequency band, the power of the transmission signal on the then described predetermined subcarrier is lower.
21. method as claimed in claim 20, wherein said restriction also comprise the restriction that distributes based on predetermined power.
22. method as claimed in claim 21, wherein for one or more subcarriers near the edge of the frequency band adjacent with another frequency band that is not used by described multicarrier system, described distribute power with Power Limitation at lower level.
23. a method that is used for management work in the transmitted power of the wireless broadband terminal of the predetermined frequency band of multicarrier system, described method comprises:
To send signal allocation to one or more subcarriers;
By described terminal described transmission signal is re-assigned to second group of subcarrier from first group of subcarrier, described second group of subcarrier has than described first group of subcarrier from the farther frequency in the edge of described predetermined frequency band;
The signal peak-to-average ratio that has less than first group of subcarrier of the signal peak-to-average ratio of second group of subcarrier on the modulation described transmission signal, described first group of subcarrier is nearer from the edge of described predetermined frequency band than described second group of subcarrier; And
With the Power Limitation of described transmission signal at predetermined level based on the proximity between described subcarrier and the described predetermined frequency band edge,
Wherein if the described transmission signal on the predetermined subcarrier has less protection frequency band for the edge of described predetermined frequency band, the power of the transmission signal on the then described predetermined subcarrier is lower.
24. method as claimed in claim 23, wherein said restriction also comprise the restriction that distributes based on predetermined power.
25. method as claimed in claim 24, wherein for one or more subcarriers near the edge of the frequency band adjacent with another frequency band that is not used by described multicarrier system, described distribute power with Power Limitation at lower level.
26. a method that is used for management work in the transmitted power of the wireless broadband terminal of the predetermined frequency band of multicarrier system, described method comprises:
To send signal allocation to one or more subcarriers;
The signal peak-to-average ratio that has less than first group of subcarrier of the signal peak-to-average ratio of second group of subcarrier on the modulation described transmission signal, described first group of subcarrier is nearer from the edge of described predetermined frequency band than described second group of subcarrier.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US68402105P | 2005-05-23 | 2005-05-23 | |
| US60/684,021 | 2005-05-23 | ||
| US11/435,428 | 2006-05-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101180811A true CN101180811A (en) | 2008-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800179960A Pending CN101180811A (en) | 2005-05-23 | 2006-05-18 | Method for up-link transmit power management in a wireless broadband terminal |
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| Country | Link |
|---|---|
| CN (1) | CN101180811A (en) |
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- 2006-05-18 CN CNA2006800179960A patent/CN101180811A/en active Pending
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Owner name: CISCO TECHNOLOGY COMPANY Free format text: FORMER OWNER: CISCO - NAVINI NETWORKS CO., LTD. Effective date: 20090807 |
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Effective date of registration: 20090807 Address after: American California Applicant after: Cisco Tech Ind. Address before: American California Applicant before: CISCO Naweini Network Co. Ltd. |
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Open date: 20080514 |