# Patent

## Title
Systems and methods for controlling the transmission and reception of packets over a common antenna

## Abstract

A system including i) first wireless communication circuitry to receive and transmit packets of a first type via an antenna, and ii) second wireless communication circuitry to receive and transmit packets of a second type via the antenna. The packets of the second type are transmitted and received during time slots having a predefined length, and the time slots are separated by time intervals during which no packets of the second type are transmitted or received by the second wireless communication circuitry. The system further includes an arbiter to control access of the first wireless communication circuitry and the second wireless communication circuitry to the antenna, wherein the arbiter causes the packets of the first type to be transmitted and received by the first wireless communication circuitry during the time intervals during which no packets of the second type are transmitted or received by the second wireless communication circuitry.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
This present disclosure is a continuation of U.S. application Ser. No. 13/269,112, filed on Oct. 7, 2011, which is a continuation of U.S. application Ser. No. 12/330,927 (now U.S. Pat. No. 8,036,170), filed on Dec. 9, 2008, which claims priority under 35 U.S.C. §119(e) to U.S. Provisional Application No. 61/016,710, filed on Dec. 26, 2007.


FIELD
The technology described in this patent document relates generally to wireless communication circuitry. More specifically, systems and methods are provided for controlling the transmission and reception of packets over a common antenna—e.g., a single antenna.
BACKGROUND
With an increasing demand for wireless-enabled electronic devices, it is not uncommon for an electronic device to be equipped with multiple types of wireless communication circuitries. In many applications, various types of wireless communication circuitries are required to share a common antenna—e.g., a single antenna. In this situation it is often necessary to control access to the shared antenna to prevent interference, particularly when the wireless communication circuitries operate in the same or close frequency bands. For example, many devices share a single antenna for both IEEE 802.11 WLAN (WiFi) and BluetoothTM communications, both of which operate in the unlicensed 2.4 GHz band. To prevent interference between WLAN and BluetoothTM signals, antenna priority is typically given to the WLAN signal. However, this may cause interruptions in BluetoothTM service, particularly when streaming data such as BluetoothTM A2DP audio transmissions.
SUMMARY
In accordance with the teachings described herein, systems and methods are provided for controlling the transmission and reception of WLAN and short range wireless signals over a single antenna. WLAN communication circuitry may be used to generate data packets for wireless transmission via the antenna and to process data packets received via the antenna. Short range wireless communication circuitry may be used to receive and transmit audio packets via the antenna. Front end connection and logic circuitry may be used to route the data packets and audio packets for wireless transmission and reception via the antenna. The audio packets are transmitted and received during time slots that are separated by predefined time intervals during which no audio packets are transmitted or received by the short range wireless communication circuitry. An arbiter may be used to control access to the antenna by the WLAN communication circuitry and short range wireless communication circuitry. The arbiter may cause the data packets to be transmitted and received by the WLAN communication circuitry during the time intervals during which no audio packets are transmitted or received by the short range wireless communication circuitry. The length of the time intervals may be calculated to maximize a throughput of the data packets and to maintain a desired throughput of the audio packets.
The WLAN communication circuitry and the short range wireless communication circuitry may operate in the same frequency band. In one example, the audio packets transmitted and received by the short range communication circuitry may be compliant with revision V1.2 of the Advanced Audio Distribution Profile (A2DP) BluetoothTM standard. The WLAN communication circuitry may be compliant with the one or more of the IEEE 802.11b, 802.11g and 802.11n standards.
In one embodiment, the audio packets are transmitted using a BluetoothTM 5+1 five slot 3-DH5 packet format. Following this a one slot acknowledgement packet is received. In addition, multiple audio packets may be transmitted with acknowledgement packets received using a preselected number of back-to-back time slots. The preselected number of back-to-back time slots may be selected to maximize the throughput of the data packets and to maintain the desired throughput of the audio packets.
A method of controlling access to a single antenna by WLAN communication circuitry and short range wireless communication circuitry may include the following steps: providing access to the single antenna by the short range wireless communication circuitry to transmit or receive audio packets during time slots that are separated by time intervals during which no audio packets are transmitted or received by the short range wireless communication circuitry, the time intervals having a predefined length; and providing access to the WLAN communication circuitry to transmit or receive data packets during the time intervals during which no audio packets are transmitted or received by the short range wireless communication circuitry.
One example system may include an antenna for sending and receiving radio frequency (RF) signals; means for generating data packets for wireless transmission via the antenna and to process data packets received via the antenna; means for receiving and transmitting audio packets via the antenna, the audio packets being transmitted and received during time slots that are separated by time intervals during which no audio packets are transmitted or received, the time intervals having a predefined length; and an arbiter configured to control access to the antenna, the arbiter causing the data packets to be transmitted and received during the time intervals during which no audio packets are transmitted or received.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of an example communication system for controlling the transmission and reception of WLAN and short range wireless packets over a single antenna.
FIG. 2 is an example of BluetoothTM A2DP stereo audio packet activity.
FIG. 3 illustrates example timing diagrams for sharing antenna access between WLAN and BluetoothTM communication circuitry.
FIG. 4 illustrates WLAN throughput between time slots of BluetoothTM frames.
FIG. 5 is an example of a standard transmission control protocol (TCP) transaction.
FIGS. 6 and 7 are graphs that may be used to select the size of a WLAN interval to provide a desired WLAN and BluetoothTM throughput.
FIGS. 8A, 8B, 8C, 8D and 8E are block diagrams respectively of a television, a vehicle, a cell phone, a media player and a Voice over Internet Protocol (VoIP) phone that may implement the present invention.



DETAILED DESCRIPTION
FIG. 1 is a block diagram of an example communication system 30 for controlling the transmission and reception of WLAN and short range wireless packets over a single antenna. The communication system 30 includes an antenna 32, wireless local area network (WLAN) communication circuitry 34, short range wireless communication circuitry 36, an arbitrator 38, and front end connection and logic circuitry 40. The WLAN communication circuitry 34 is configured to generate data packets for wireless transmission via the antenna 32 and to process data packets received via the antenna 32. The WLAN communication circuitry 34 may, for example, generate and process TCP transactions for an IEEE 802.11 compliant WLAN. The short range wireless communication circuitry 36 is configured to transmit and/or receive audio packets via the antenna 32. The short range wireless communication circuitry 36 may, for example, be a BluetoothTM device that transmits and receives packets of compressed audio information in accordance with the Advanced Audio Distribution Profile (A2DP) BluetoothTM standard. The front end connection logic circuitry 40 routes packets to/from the antenna 32 and each of the WLAN communication circuitry 34 and the short range wireless communication circuitry 36.
In one implementation, the arbiter 38 controls access to the antenna 32 so that only one of the WLAN communication circuitry 34 or the short range wireless communication circuitry 36 has access to the antenna 32 at a time. This is particularly important when the WLAN communication circuitry 34 and the short range wireless communication circuitry 36 operate in the same frequency band, such as an IEEE 802.11 WLAN (WiFi) and a BluetoothTM compliant device which both operate in the unlicensed 2.4 GHz band.
An example of typical BluetoothTM A2DP stereo audio packets are illustrated in FIG. 2. In order to provide continuous audio, a BluetoothTM device typically attempts to transmit the A2DP audio packets without pausing until an audio buffer in the receiver is filled. When the audio buffer is filled, transmission of the A2DP audio packets is typically paused for short time intervals until additional audio data is needed by the buffer. However, as illustrated in FIG. 2, this approach typically requires the BluetoothTM device to access the antenna for long periods of time with only short intervals between transmissions, preventing the WLAN communication circuitry 34 from accessing the antenna 32. To address this problem, the arbiter 38 gives antenna priority to the audio packets from the short range wireless communication circuitry 36 and causes the audio packets to be transmitted during time slots that are separated by time intervals (i.e., gaps) having predefined lengths. The WLAN communication circuitry 34 is given access to the antenna 32 during time intervals between transmission of audio packets. In this way, the throughput of the WLAN data packets may be maximized, while maintaining a desired throughput for the short range audio packets.
FIG. 3 illustrates example timing diagrams for sharing antenna access between WLAN and BluetoothTM communication circuitry. The illustrated examples utilize a five slot transmission immediately followed by a one slot acknowledgement (referred to herein as a “5+1 slot”) for transmitting BluetoothTM signals. A single BluetoothTM slot is 625 μs, and a BluetoothTM frame may be transmitted over one, three or five 625 μs time-slots. As understood by persons skilled in the art, a 5+1 multi-slot packet format utilizes five-slot packets to provide greater throughput compared to a single 625 is slot. The BluetoothTM packet size in the illustrated examples are 3-DH5, which means that each packet has a gross air rate of 3.0 Mbps and occupies five 625 μs time-slots. It should be understood, however, that other slot packet formats and/or packet sizes could be used in other examples.
FIG. 3 illustrates three example timing configurations, respectively designated by reference numbers 50, 60 and 70. In each example timing configuration, groups of one or more BluetoothTM slots 52, 62, 72 are separated by time intervals 54, 64, 74 for transmitting or receiving WLAN signals. Specifically, in the first example timing configuration 50, each single 5+1 BluetoothTM slot 52 is followed by a WLAN time interval 54. In the second and third examples 60, 70, back-to-back BluetoothTM slots 62, 72 are separated by longer WLAN time intervals 64, 74.
The transmission of back-to-back BluetoothTM slots, as shown in examples 60 and 70, allows for a longer WLAN time interval which increases WLAN throughput. However, if the WLAN time interval is made too large, then there will not be enough throughput of the BluetoothTM audio packets to satisfy the requirements of the receiver buffer. Accordingly, the choice of how many BluetoothTM slots are transmitted back-to-back and the length of the WLAN time intervals should be selected to maximize the throughput of the WLAN transmissions while maintaining sufficient throughput of the BluetoothTM audio packets to satisfy the requirements of the receiver buffer for providing continuous audio. Moreover, WLAN time intervals should be selected in integral amounts of BluetoothTM slots so as to not disturb the BluetoothTM timing.
As illustrated in FIG. 4, the potential WLAN throughput is constrained by the number of TCP transactions 80 that may be performed during the WLAN time intervals 82. An example of a standard TCP transaction is shown in FIG. 5. The amount of time necessary to perform a TCP transaction, and thus the number of TCP transactions that may fit within the WLAN time interval 82, is dependent on the characteristics of the WLAN. As an example, following are examples of time domain calculations for one TCP transaction within two WLANs having different network characteristics. The first example shows time domain calculations for a TCP transaction in an 801.11g WLAN with a 54 Mbps data rate, and the second example shows time domain calculations for the same TCP transaction in an 802.11b WLAN with a 11 Mbps data rate.
Example 1
IEEE 802.11g @ 54 Mbps
DIFS: 34 μs
SIFS: 16 μs
11 g_preamble: 20 μs
Symbol_time: 4 μs



  
    TCP
     Frame:
  




  
    
      11
      ⁢
      
        
      
      ⁢
      g_preamble
    
    +
    
      Symbol_time
      ×
      
        roundup
        (
        
          MTU
          
            bits_per
            ⁢
            _symbol
          
        
        )
      
    
  



    
    
        Example: 20 μs+248 μs (if MTU=1536 bytes at 54 M)
    
    





  
    8
    ⁢
    
      02.11 
      PHY ACK
      :
    
  




  
    
      11
      ⁢
      
        
      
      ⁢
      g_preamble
    
    +
    
      Symbol_time
      ×
      
        roundup
        (
        
          
            14
            ⁢
            
              
            
            ⁢
            bytes_of
            ⁢
            _ACK
          
          
            bits_per
            ⁢
            _symbol
          
        
        )
      
    
  



    
    
        Example: 20 μs+4 μs
    
    





  
    TCP ACK
     Frame:
  




  
    
      11
      ⁢
      
        
      
      ⁢
      g_preamble
    
    +
    
      Symbol_time
      ×
      
        roundup
        (
        
          
            76
            ⁢
            
              
            
            ⁢
            bytes_of
            ⁢
            _header
          
          
            bits_per
            ⁢
            _symbol
          
        
        )
      
    
  



    
    
        Example: 20 μs+12 μs

Total=DIFS+Data Frame+SIFS+802.11 ACK+DIFS+TCP ACK frame+SIFS+802.11 ACK Frame=34+248+16+24+34+32+16+24=0.428 msec.

    
    


Example 2
IEEE 802.11b @ 11 Mbps
DIFS: 50 μs
SIFS: 10 μs
11b_preamble: 192 μs (assuming a long preamble)



  
    TCP
     Frame:
  




  
    
      11
      ⁢
      
        
      
      ⁢
      b_preamble
    
    +
    
      MTU
      data_rate
    
  



    
    
        Example: 92 μs+1118 μs (if MTU=1536 bytes at 11 M)
    
    





  
    802.11 
    PHY ACK
    :
  




  
    
      11
      ⁢
      
        
      
      ⁢
      b_preamble
    
    +
    
      
        14
        ⁢
        
          
        
        ⁢
        bytes_of
        ⁢
        _ACK
      
      data_rate
    
  



    
    
        Example: 192 μs+11 μs
    
    





  
    TCP ACK
     Frame:
  




  
    
      11
      ⁢
      
        
      
      ⁢
      b_preamble
    
    +
    
      
        76
        ⁢
        
          
        
        ⁢
        bytes_of
        ⁢
        _ACK
      
      data_rate
    
  



    
    
        Example: 192 μs+56 μs

Total TCP Frame=DIFS+Data Frame+SIFS+802.11 ACK+DIFS+TCP ACK Frame+SIFS+802.11 ACK Frame=50+1310+10+203+50+248+10+203=2.084 msec.

    
    


As seen from the above calculations, the number of TCP transaction that can be completed within the WLAN time interval 82 may vary significantly depending on the network characteristics. The WLAN throughput for a given WLAN time interval may be calculated using the following equation.



  
    WLAN
       throughput:
  




  
    
      
        Number_of
        ⁢
        _TCP
        ⁢
        _Transactions
        ×
        
          (
          
            MTU
            ⁢
            
              
            
            ⁢
            ⋯
            ⁢
            
              
            
            ⁢
            headers
          
          )
        
      
      WLAN_Interval
    
    ,
  



where MTU is the number of bytes within the WLAN frame payload.
In addition to maximizing the WLAN throughput, the number of back-to-back BluetoothTM slots and the length of the WLAN interval should also be selected to provide enough throughput of the BluetoothTM audio signal to satisfy the requirements of the audio buffer in the BluetoothTM receiver. In addition to the number of back-to-back slots and the size of the WLAN interval, the BluetoothTM throughput is also dependent on the packet size (e.g., 3-DH5, 3-DH3, etc.) and the slot packet format of the BluetoothTM audio signal. The following equation may be used to determine the throughput for a BluetoothTM A2DP audio signal with a standard 3-DH5 packet size and a 5+1 multi-slot packet format.



  
    Bluetooth  throughout:
  




  
    
      
        Number_of
        ⁢
        _slots
        ×
        
          (
          
            BT_payload
            -
            BT_headers
          
          )
        
      
      Interval
    
    ,
  



Number_of_slots is the number of back-to-back BluetoothTM slots;
BT_payload is the number of payload bytes in the 5+1 multi-slot packet;
BT_headers is the number of header bytes in the 5+1 multi-slot packet;
Interval=Number_of_slots×(BT—5—1_slot)+Length of WLAN interval; and
BT—5—1_slot=6×625 μs.
FIGS. 6 and 7 are graphs that may be used to select the size of the WLAN interval to provide a desired WLAN and BluetoothTM throughput. FIG. 6 plots the BluetoothTM throughput verses the WLAN interval size for two types of standard BluetoothTM packets (3-DH5 and 3-DH3). FIG. 7 plots the WLAN throughput verses the WLAN interval size for various 802.11 data rates, assuming a 384 byte MTU. When determining the number of back-to-back BluetoothTM slots and the size of the WLAN interval, the designer may use these graphs to balance the resultant BluetoothTM throughput with the resultant WLAN throughput. In this way, the WLAN throughput may be maximized while maintaining a desired BluetoothTM throughput. For example, in the case of a BluetoothTM A2DP audio link, a throughput between 300 kbps and 800 kbps is typically needed.
With reference first to FIG. 6, the graph depicts a first curve 90 for a 3-DH5 BluetoothTM packet and a second curve 92 for a 3-DH3 BluetoothTM packet. The illustrated example shows that an 800 kbps throughput may be maintained for a 3-DH5 BluetoothTM packet with a WLAN interval of approximately 12.5 msec. The graph shown in FIG. 7 may then be used to determine the WLAN throughput for a given WLAN interval. For instance, FIG. 7 shows that a WLAN interval of 12.5 msec should result in a maximum WLAN throughput of approximately 1.1 Mbps for an 802.11 WLAN with a 5.5 Mbps data rate. If this WLAN throughput is not sufficient, then a larger WLAN interval may be provided by sacrificing some amount of BluetoothTM throughput. In this manner, a desired balance between the WLAN and BluetoothTM throughputs may be achieved.
Referring now to FIGS. 8A-8E, various exemplary implementations of the present invention are shown. With reference to FIG. 8A, the present invention may be embodied in a high definition television (HDTV) 420. The present invention may implement either or both signal processing and/or control circuits, which are generally identified in FIG. 8A at 422, a WLAN interface 429, a BluetoothTM interface 425 and/or mass data storage 427 of the HDTV 420. HDTV 420 receives HDTV input signals in either a wired or wireless format and generates HDTV output signals for a display 426. In some implementations, signal processing circuit and/or control circuit 422 and/or other circuits (not shown) of HDTV 420 may process data, perform coding and/or encryption, perform calculations, format data and/or perform any other type of HDTV processing that may be required.
HDTV 420 may communicate with mass data storage 427 that stores data in a nonvolatile manner such as optical and/or magnetic storage devices. HDTV 420 may be connected to memory 428 such as RAM, ROM, low latency nonvolatile memory such as flash memory and/or other suitable electronic data storage. HDTV 420 also may support connections with a WLAN via a WLAN network interface 429 and may support BluetoothTM communications via a BluetoothTM interface 425.
Referring now to FIG. 8B, the present invention implements a control system of a vehicle 430, a WLAN interface 448, a BluetoothTM interface 449 and/or mass data storage 446 of the vehicle control system. Control system 440 may receive signals from input sensors 442 and/or output control signals to one or more output devices 444. In some implementations, control system 440 may be part of an anti-lock braking system (ABS), a navigation system, a telematics system, a vehicle telematics system, a lane departure system, an adaptive cruise control system, a vehicle entertainment system such as a stereo, DVD, compact disc and the like. Still other implementations are contemplated.
The powertrain control system 432 and/or the other control systems 440 may communicate with mass data storage 446 that stores data in a nonvolatile manner. Mass data storage 446 may include optical and/or magnetic storage devices for example hard disk drives HDD and/or DVDs. The powertrain control system 432 and/or other control systems 440 may be connected to memory 447 such as RAM, ROM, low latency nonvolatile memory such as flash memory and/or other suitable electronic data storage. The powertrain control system 432 and/or other control systems 440 (e.g., the vehicle entertainment system) also may support connections with a WLAN via a WLAN network interface 448 and a BluetoothTM interface 449.
Referring now to FIG. 8C, the present invention may be embodied in a cellular phone 450 that may include a cellular antenna 451. The present invention may implement either or both signal processing and/or control circuits, which are generally identified in FIG. 8C at 452, a WLAN interface 468, a mass data storage 464 and/or a BluetoothTM interface 469 of the cellular phone 450. In some implementations, cellular phone 450 includes a microphone 456, an audio output 458 such as a speaker and/or audio output jack, a display 460 and/or an input device 462 such as a keypad, pointing device, voice actuation and/or other input device. Signal processing and/or control circuits 452 and/or other circuits (not shown) in cellular phone 450 may process data, perform coding and/or encryption, perform calculations, format data and/or perform other cellular phone functions.
Cellular phone 450 may communicate with mass data storage 464 that stores data in a nonvolatile manner such as optical and/or magnetic storage devices for example hard disk drives HDD and/or DVDs. Cellular phone 450 may be connected to memory 466 such as RAM, ROM, low latency nonvolatile memory such as flash memory and/or other suitable electronic data storage. Cellular phone 450 also may support connections with a WLAN via a WLAN network interface 468 and may support BluetoothTM communications via a BluetoothTM interface 469.
Referring now to FIG. 8D, the present invention may be embodied in a media player 500. The present invention may implement either or both signal processing and/or control circuits, which are generally identified in FIG. 8D at 504, a WLAN interface 516, a BluetoothTM interface 517 and/or mass data storage 510 of the media player 500. In some implementations, media player 500 includes a display 507 and/or a user input 508 such as a keypad, touchpad and the like. In some implementations, media player 500 may employ a graphical user interface (GUI) that typically employs menus, drop down menus, icons and/or a point-and-click interface via display 507 and/or user input 508. Media player 500 further includes an audio output 509 such as a speaker and/or audio output jack. Signal processing and/or control circuits 504 and/or other circuits (not shown) of media player 500 may process data, perform coding and/or encryption, perform calculations, format data and/or perform any other media player function.
Media player 500 may communicate with mass data storage 510 that stores data such as compressed audio and/or video content in a nonvolatile manner. In some implementations, the compressed audio files include files that are compliant with MP3 format or other suitable compressed audio and/or video formats. The mass data storage may include optical and/or magnetic storage devices for example hard disk drives HDD and/or DVDs. The HDD may be a mini HDD that includes one or more platters having a diameter that is smaller than approximately 1.8′′. Media player 500 may be connected to memory 514 such as RAM, ROM, low latency nonvolatile memory such as flash memory and/or other suitable electronic data storage. Media player 500 also may support connections with a WLAN via a WLAN network interface 516 and may support BluetoothTM communications via a BluetoothTM interface 517. Still other implementations in addition to those described above are contemplated.
Referring to FIG. 8E, the present invention may be embodied in a Voice over Internet Protocol (VoIP) phone 600 that may include an antenna 602. The present invention may implement either or both signal processing and/or control circuits, which are generally identified in FIG. 8E at 604, a wireless interface and/or mass data storage of the VoIP phone 600. In some implementations, VoIP phone 600 includes, in part, a microphone 606, an audio output 608 such as a speaker and/or audio output jack, a display monitor 610, an input device 612 such as a keypad, pointing device, voice actuation and/or other input devices, and communication modules 614, such as a WLAN (WiFi) module and a BluetoothTM module. Signal processing and/or control circuits 604 and/or other circuits (not shown) in VoIP phone 600 may process data, perform coding and/or encryption, perform calculations, format data and/or perform other VoIP phone functions.
VoIP phone 600 may communicate with mass data storage 616 that stores data in a nonvolatile manner such as optical and/or magnetic storage devices, for example hard disk drives HDD and/or DVDs. The HDD may be a mini HDD that includes one or more platters having a diameter that is smaller than approximately 1.8′′. VoIP phone 600 may be connected to memory 618, which may be a RAM, ROM, low latency nonvolatile memory such as flash memory and/or other suitable electronic data storage. VoIP phone 600 is configured to establish communications link with a VoIP network (not shown) via a Wi-Fi communication module 614, and is also configured to provide BluetoothTM communications via a BluetoothTM communication module 614.
This written description uses examples to disclose the invention, including the best mode, and also to enable a person skilled in the art to make and use the invention. The patentable scope of the invention may include other examples that occur to those skilled in the art.

## Claims

1. A wireless communication device, comprising:
an antenna;
a first communication circuitry coupled to the antenna, the first communication circuitry configured to generate first packets for wireless transmission, via the antenna, in accordance with a first communication protocol;
a second communication circuitry coupled to the antenna, the second communication circuitry configured to generate second packets for wireless transmission, via the antenna, in accordance with a second communication protocol; and
an access control circuitry coupled to the first communication circuitry and the second communication circuitry, the access control circuitry configured to control access of the first communication circuitry and the second communication circuitry to the antenna,
wherein the access control circuitry
(i) causes the first communication circuitry to access the antenna during time slots for the wireless transmission of the first packets, wherein the time slots are respectively separated by time intervals of a predefined length, and
(ii) causes the second communication circuitry to access the antenna during the time intervals of the predefined length for the wireless transmission of the second packets.

2. The wireless communication device of claim 1, wherein the time slots and the time intervals have a timing profile that is predefined by a communication standard that is one of multiple communication standards that are available for communicating the first type of packets, and wherein the wireless communication device is configured to choose, for communicating the first packets, the communication standard over the other communication standards based on maximizing packet-throughput of the communicating of the second packets.

3. The wireless communication device of claim 2, wherein the choosing is further based on maintaining sufficient throughput of the first packets to satisfy requirements of a receiver buffer for providing continuous audio.

4. The wireless communication device of claim 2, wherein the multiple communication standards include a 3-DH3 standard and a 3-DH5 standard.

5. The wireless communication device of claim 2, wherein the multiple communication standards differ in number of back-to-back time slots.

6. The wireless communication device of claim 2, wherein the choosing is based on (i) a function of throughput of the first packets versus the predefined length and (ii) a function of throughput of the second packets versus the predefined length.

7. The wireless communication device of claim 1, wherein the wireless communication device is configured to select the predetermined length so as to maximize throughput of the second packets while maintaining a predefined throughput of the first packets.

8. The wireless communication device of claim 1, wherein the first packets communicate audio and the second packets communicate data.

9. The wireless communication device of claim 1, wherein the time slots are of uniform length.

10. The wireless communication device of claim 1, wherein the first packets and the second packets are communicated over the same frequency band.

11. A method performed by a wireless communication device having an antenna, the method comprising:
generating first packets for wireless transmission, via the antenna, in accordance with a first communication protocol;
generating second packets for wireless transmission, via the antenna, in accordance with a second communication protocol; and
providing selective access to the antenna for transmission of the first packets and the second packets, so as to
enable the first packets to be transmitted through the antenna only during time slots, wherein the time slots are respectively separated by time intervals of a predefined length, and
enable the second packets to be transmitted through the antenna only during the time intervals of the predefined length.

12. The method of claim 11, wherein the time slots and the time intervals have a timing profile that is predefined by a communication standard that is one of multiple communication standards that are available for communicating the first type of packets, and wherein the method further comprises:
choosing, by the wireless communication device, for communicating the first packets, the communication standard over the other communication standards based on maximizing packet-throughput of the communicating of the second packets.

13. The method of claim 12, wherein the choosing is further based on maintaining sufficient throughput of the first packets to satisfy requirements of a receiver buffer for providing continuous audio.

14. The method of claim 12, wherein the multiple communication standards include a 3-DH3 standard and a 3-DH5 standard.

15. The method of claim 12, wherein the multiple communication standards differ in number of back-to-back time slots.

16. The method of claim 12, wherein the choosing is based on (i) a function of throughput of the first packets versus the predefined length and (ii) a function of throughput of the second packets versus the predefined length.

17. The method of claim 11, further comprising:
selecting, by the wireless communication device, the predetermined length so as to maximize throughput of the second packets while maintaining a predefined throughput of the first packets.

18. The method of claim 11, wherein the first packets communicate audio and the second packets communicate data.

19. The method of claim 11, wherein the time slots are of uniform length.

20. A wireless communication device, comprising:
an antenna;
means for generating first packets for wireless transmission, via the antenna, in accordance with a first communication protocol;
means for generating second packets for wireless transmission, via the antenna, in accordance with a second communication protocol; and
means for providing selective access to the antenna for transmission of the first packets and the second packets, so as to
enable the first packets to be transmitted through the antenna only during time slots, wherein the time slots are respectively separated by time intervals of a predefined length, and
enable the second packets to be transmitted through the antenna only during the time intervals of the predefined length.