Operators refarm GSM frequencies and maintain GSM services
Smartphones need bandwidth, and bandwidth needs frequencies. Thus, operators are refarming part of the GSM frequencies to HSPA and LTE. A lean and modernized GSM works with less spectrum and provides fallback coverage for smartphones.
Multicarrier power amplifiers for Single RAN with GSM and HSPA pool and optimize output power
Traditionally, multi-carrier power amplifiers shared power equally and statically between carriers. With software activated power pooling, the radio frequency (RF) power is shared dynamically, saving on idle traffic channels and making more channels available for active transmission. In GSM only mode this saves carriers, and in GSM and HSPA mixed configurations this saves energy or increases coverage.
Maintain voice capacity, coverage and quality using half the GSM spectrum
After GSM spectrum has been refarmed to HSPA or LTE, OSC (orthogonal sub channel) – a software feature that works with the majority of existing GSM handsets – doubles the radio resources for circuit switched voice calls.
Conventionally, limited spectrum base stations also needed to be split, which resulted in degraded network quality. DFCA (dynamic frequency and channel allocation) – another software feature – assigns radio channels with sufficient carrier to interferencee ratio based on real time measurements: The base station controller detects the best radio channel allocation for new calls and incoming handovers.
This doubles voice and data capacity, improves cell edge and indoor signals, and lowers interference.
Where should the network look for a phone? Start paging the last known cell
Networks alert mobile phones for incoming voice and data calls, and text messages by sending paging requests to all the cells. Precise paging – a software feature – starts only with the last known and adjacent cells, reducing the paging load by up to 70%.
Small packets are handled with one time slot instead of five, increasing capacity fivefold
Every mobile device belongs to a multi slot class that says how many time slots the device gets. Most common are class 4 and class 5, bundling four or five slots. Smart resource adaptation means for a small packet only one time slot is used. Smartphones mostly transfer small packets, so smart resource adaption increases capacity fivefold.
Nokia Siemens Networks prepares GSM for mobile broadband
Operators can leverage GSM due to its global, affordable voice coverage. When an operator needs a lean GSM that serves voice and data with fewer frequencies and caters to smartphones, the Nokia Siemens Networks software GSM suite has unique answers.
Find out more here.
This post is by Maik Braun from our Mobile Broadband team.