gprs: fix T3186 encoding in Sysinfo 13
The timer T3186, which is described in 3GPP TS 44.060, is using 3 bits of the si13 mac block. This requires special encoding. In the case of T3186, the value is encoded by the formula: bits = t/500-1. Our implementation uses the formula bits=t/500, which is incorrect. Change-Id: Ifd340c536cff2d1c4b1b3677a358ea95438801eb
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@ -566,6 +566,8 @@ static int append_gprs_mobile_alloc(struct bitvec *bv)
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static int encode_t3192(unsigned int t3192)
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{
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/* See also 3GPP TS 44.060
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Table 12.24.2: GPRS Cell Options information element details */
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if (t3192 == 0)
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return 3;
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else if (t3192 <= 80)
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@ -645,7 +647,11 @@ static int append_gprs_cell_opt(struct bitvec *bv,
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return drx_timer_max;
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bitvec_set_uint(bv, gco->nmo, 2);
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bitvec_set_uint(bv, gco->t3168 / 500, 3);
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/* See also 3GPP TS 44.060
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Table 12.24.2: GPRS Cell Options information element details */
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bitvec_set_uint(bv, gco->t3168 / 500 - 1, 3);
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bitvec_set_uint(bv, t3192, 3);
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bitvec_set_uint(bv, drx_timer_max, 3);
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/* ACCESS_BURST_TYPE: Hard-code 8bit */
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