Wednesday, June 15, 2005
Merging GSM & WLAN in a handset OK
Of course, Quorum systems has the answer:
CommsDesign - Merging GSM with WLAN in a mobile handset needn't cause interference: "When GSM is transmitting, the WLAN subsystem can't receive WLAN packets (Fig. 1). Likewise, when GSM is in receive or monitor mode, the WLAN can' transmit, as it will desensitize the GSM receiver. In addition, one radio chain must be turned off while the other transmits, due to interaction between the two transmitters. In most cases, the GSM transmitter will be given precedence and the WLAN transmitter will be disabled, as the existing infrastructure limits any changes to the GSM standard. What results is the need for some type of traffic management, or scheduling within the multi-mode solution. This is often achieved in the upper levels of the architecture. This scheduling, for instance, may exist within the application software or top-level baseband protocol stacks. While the result is a functional multi-mode solution, only one standard is ever instantaneously active at any time. As a consequence, only one of the two existing radio chains would ever be used at one time."
CommsDesign - Merging GSM with WLAN in a mobile handset needn't cause interference: "When GSM is transmitting, the WLAN subsystem can't receive WLAN packets (Fig. 1). Likewise, when GSM is in receive or monitor mode, the WLAN can' transmit, as it will desensitize the GSM receiver. In addition, one radio chain must be turned off while the other transmits, due to interaction between the two transmitters. In most cases, the GSM transmitter will be given precedence and the WLAN transmitter will be disabled, as the existing infrastructure limits any changes to the GSM standard. What results is the need for some type of traffic management, or scheduling within the multi-mode solution. This is often achieved in the upper levels of the architecture. This scheduling, for instance, may exist within the application software or top-level baseband protocol stacks. While the result is a functional multi-mode solution, only one standard is ever instantaneously active at any time. As a consequence, only one of the two existing radio chains would ever be used at one time."
